What’s Up - July 2018

Any advice for young girls going into the sciences?

It’s Pi Day!

Pi Day, the informal holiday beloved by math enthusiasts — and even by the math averse — is here! March 14 marks the yearly celebration of the mathematical constant π (pi).

What is Pi?

Pi (3.1415….) is the ratio of circumference to diameter in a circle. Any time you want to find out the distance around a circle when you have the distance across it, you will need this formula.

Despite its frequent appearance in math and science, you can’t write pi as a simple fraction or calculate it by dividing two integers. For this reason, pi is said to be “irrational.” Pi’s digits extend infinitely and without any pattern, adding to its intrigue and mystery.

How Do We Use Pi at NASA?

Measurements: Pi can be used to make measurements – like perimeter, area and volume. 

For example, sometimes we use lasers to explode ice samples and study their composition. In this scenario, we can uses pi to calculate the width of the laser beam, which in turn can be used to calculate the amount of energy, or fluence, that hits the ice sample. A larger fluence equals a bigger explosion in the ice.

Commanding Rovers: Pi is also used every day commanding rovers on the Red Planet. Everything from taking images, turning the wheels, driving around, operating the robotic arm and even talking to Earth!

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The NASA Village

Today in the NASA Village… That’s my Ride: Robots and Rovers.

Future cars could very likely resemble the rovers currently in NASA’s parking lot. The newest rovers have gotten rid of the more traditional ideas and come up with some pretty amazing machinery.  Amy Fritz is a mechanical engineer that works with these rovers.  When I asked Amy how she found herself in such a cool job she said, “My parents were very big influences on my career choices. I can remember when I was a little girl and my dad and I would build Legos together, or we would take the remote apart to see how it worked.  That really inspired me to want to pursue a career in engineering.  I then later developed an affinity for cars so, of course, the only rational thing to do was to go after a degree in mechanical engineering.”

The wheels of this rover move independent of each other, regardless of which direction the vehicle points.  To parallel park one would just pull up to the spot and turn the wheels to scoot in.  I am not sure how much parallel parking is required on other planets, but it could help us move very close to an object for observation out the “front” of the vehicle, while moving laterally.

The bubble in the front of the glass is actually a magnifying glass so astronauts can better see the minerals on other planets without having to leave the rover!

These rovers also allow one to change drivers, without anyone having to change seats!

Here is a video of the Modular Robotic Vehicle (MRV) in action.

Rovers have been used on the surface of the moon in the past. Check out the Apollo 16 rover as astronauts John Young and Charlie Duke take a spin.

The rovers can also be hybrids of rovers and humanoid robots.  For instance, the robot could serve as a scout, providing advanced maps and soil samples, and beginning work on the infrastructure that astronauts would need.  The crew that follows would then be much more prepared for the exploration ahead.  Amy describes her working life as very…interesting.  “One minute you’re working on a design, sitting at your desk and the next minute you’re being called into the high bay to replace a suspension arm on one of the rovers.”

The first Robonaut began in 1997.  The goal was to build a humanoid robot that could assist us with tasks where it might be useful to have another pair of hands.  This type of robot could also perform jobs that where it was too dangerous to risk human life or even too time-consuming and mundane.

Robonaut was revealed in 2010 as the most advanced humanoid robot of its time.  It made its way to the International Space Station on-board the space shuttle Discovery. It was the first humanoid-robot in space and it rode on the final shuttle mission.  This technology is still developing today.

Meet the future of Robonaut on station:

This technology could someday service communications, weather and reconnaissance satellites, which have direct benefits on Earth.  The next step for robotic capabilities is to explore near-Earth objects, including asteroids and comets, and eventually Mars. Something Amy mentioned that I found interesting was her greatest hurdle was asking for help.  “I know that might sound silly, but I’m used to always being independent and trying to figure things out for myself.“  This is one of the things I have discovered about myself too.  The kind of drive that Amy has is special, that desire to figure things out for yourself. But, remember, having the humility to ask questions and ask for help can lead you even further!

Next time on the NASA Village… The Lady in Charge.

Do you want more stories?  Find our NASA Villagers here!

Solar System: Things to Know This Week

Here are a few things you should know about our solar system this week:

1. Gearing Up for a Grand Finale

There’s just a year left until the Cassini mission begins its Grand Finale – the final phase of its mission, during which the spacecraft will dive repeatedly between the planet and the rings. To get ready, the Cassini team has launched an enhanced, mobile device-friendly version of the mission website. The site includes information about Cassini, Saturn, the moons and the rings – but it also tells the human stories behind one of the most ambitions expeditions of all time.

2.Caught in Transit

On Monday, May 9, the planet Mercury will cross directly in front of the sun, an event that hasn’t occurred since 2006 and won’t happen again until 2019. Find out how to watch HERE.  

3. A Moon for Makemake

Our Hubble Space Telescope has spotted a small, dark moon orbiting Makemake (pronounced “MAH-kay MAH-kay). Make make is the second brightest icy dwarf planet – after Pluto – in the faraway Kuiper Belt.

4. The Age of the Aquarids

The Eta Aquarid meteor shower is the first of two showers that occur each year as a result of Earth passing through dust released by Halley’s Comet. This year, it should peak on the night of May 5/6. Get tips for watching HERE.

5. The Southern Lights of Saturn

On May 4, Cassini will reach periapse, the closest point to Saturn in the spacecraft’s orbit. At about this time, Cassini’s cameras will monitor Saturn’s south polar aurorae, and also image the bright limb of the planet to better understand its upper haze layers.

Want to learn more? Read our full list of the 10 things to know this week about the solar system HERE.

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NASA Spotlight: Brandon Rodriguez, Jet Propulsion Laboratory Education Specialist 

Brandon Rodriguez is an education specialist at our Jet Propulsion Laboratory (JPL) in Pasadena, California where he provides resources and training to K-12 schools across the Southwest. Working with a team at JPL, he develops content for classroom teachers, visits schools and speaks with students and trains future teachers to bring NASA into their classroom. When he’s not in the classroom, Brandon’s job takes him on research expeditions all around the world, studying our planet’s extreme environments.  

Fun fact: Brandon wakes up every morning to teach an 8 a.m. physics class at a charter school before heading to JPL and clocking in at his full time job. When asked why? He shared, “The truth is that I really feel so much better about my role knowing that we’re not ‘telling’ teachers what to do from our ivory tower. Instead, I can “share” with teachers what I know works not just in theory, but because I’m still there in the classroom doing it myself.” - Brandon Rodriguez

Brandon took time from exciting the next generation of explorers to answer some questions about his life and his career: 

What inspired you to work in the educational department at NASA?

I was over the moon when I got a call from NASA Education. I began my career as a research scientist, doing alternative energy work as a chemist. After seven years in the field, I began to feel as if I had a moral responsibility to bring access to science to a the next generation. To do so, I quit my job in science and became a high school science teacher. When NASA called, they asked me if I wanted a way to be both a scientist and an educator- how could I resist?

You were born in Venezuela and came to the U.S. when you were 12 years old. Can you tell us the story of why and how you came to America?

I haven't been back to Venezuela since I was very young, which has been very difficult for me. Being an immigrant in the USA sometimes feels like you're an outsider of both sides: I'm not truly Latin, nor am I an American. When I was young, I struggled with this in ways I couldn't articulate, which manifested in a lot of anger and got me in quite a bit of trouble. Coming to California and working in schools that are not only primarily Latinx students, but also first generation Latinx has really helped me process that feeling, because it's something I can share with those kids. What was once an alienating force has become a very effective tool for my teaching practice.

Does your job take you on any adventures outside of the classroom and if so, what have been your favorite endeavors?

I'm so fortunate that my role takes me all over the world and into environments that allow to me to continue to develop while still sharing my strengths with the education community. I visit schools all over California and the Southwest of the USA to bring professional development to teachers passionate about science. But this year, I was also able to join the Ocean Exploration Trust aboard the EV Nautilus as we explored the Pacific Remote Island National Marine Monument. We were at sea for 23 days, sailing from American Samoa to Hawaii, using submersible remotely operated vehicles to explore the ocean floor. 

Image Credit: Nautilus Live 

We collected coral and rock samples from places no one has ever explored before, and observed some amazing species of marine creatures along the way.

Image Credit: Nautilus Live 

What keeps you motivated to go to work every day?

There's no greater motivation than seeing the product of your hard work, and I get that everyday through students. I get to bring them NASA research that is "hot off the press" in ways that their textbooks never can. They see pictures not online or on worksheets, but from earlier that day as I walked through JPL. It is clearly that much more real and tangible to them when they can access it through their teacher and their community.

Do you have any tips for people struggling with their science and math classes? 

As someone who struggled- especially in college- I want people to know that what they struggle with isn't science, it's science classes. The world of research doesn't have exams; it doesn't have blanks to be filled in or facts to be memorized. Science is exploring the unknown. Yes, of course we need the tools to properly explore, and that usually means building a strong academic foundation. But it helped me to differentiate the end goal from the process: I was bad at science tests, but I wanted to someday be very good at science. I could persevere through the former if it got me to the latter.

If you could safely visit any planet, star, or solar system, where would you visit and what would you want to learn?

Europa, without a doubt. Imagine if we found even simple life once more in our solar system- and outside of the habitable zone, no less. What would this mean for finding life outside of our solar system as a result? We would surely need to conclude that our sky is filled with alien worlds looking back at us.

Is there a moment or project that you feel defined (or significantly impacted) your career up to today?

While I never worked closely with the mission, Insight was a really important project for me. It's the first time while at JPL I was able to see the construction, launch and landing of a mission.

If you could name a spaceship, what would you name it?

For as long as I can remember, I've been watching and reading science fiction, and I continue to be amazed at how fiction informs reality. How long ago was it that in Star Trek, the crew would be handing around these futuristic computer tablets that decades later would become common iPads?  In their honor, I would be delighted if we named a ship Enterprise.

Thanks so much Brandon! 

Additional Image Credit: MLParker Media

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What You Need to Know About Our Space Launch System (SLS) Rocket’s Green Run Test

The comprehensive test series called Green Run for our Space Launch System (SLS) rocket is underway at Stennis Space Center in Mississippi. 

During Green Run, the rocket’s massive, 212-foot-tall core stage — the same flight hardware that will help launch Artemis I to the Moon – will operate together for the first time. 

Here’s what you need to know about this top-to-bottom test series of our megarocket’s huge core:

The Meaning Behind the Name 

Why is it called Green Run? “Green” refers to the new, untested hardware (AKA the core stage), and “run” represents the succession of tests the core stage paces through. One by one, this series will bring together several “firsts” for the rocket stage as the flight hardware undergoes eight different tests. Each test is designed to gradually bring our rocket’s core stage and all its systems to life for the first time. 

So far, engineers have completed three of the series: the modal test, the avionics power-on, and the safety systems checkout. The safety systems are designed to end the test and shutdown systems automatically under undesirable conditions.

You can follow the progress of Green Run with this Green Run checklist infographic. Our team will be updating in real time as each Green Run test is completed.

Setting the Stage

The world’s tallest rocket stage is tested in an equally giant test stand.  We upgraded the B-2 Test Stand used for the Saturn V rocket stages during the Apollo Program and, later, for the Space Shuttle Program. Now, the B-2 Test Stand is customized for testing our SLS core stage. When all four core stage engines fire up, they can generate some serious heat. So, the B-2 Test Stand will use roughly 100,000 gallons of water every 18 seconds to protect the stand and the hardware.

Hot fire in 3, 2, 1…

Speaking of engines firing up, the core stage will really show what it is capable of during the grand finale of Green Run. The goal is for the entire core stage to operate as one for up to 8.5 minutes — and that includes an impressive firing of all four RS-25 engines simultaneously. Just like at launch, more than 733,000 gallons of liquid propellant will flow from the two propellant tanks through the fuel lines to feed the RS-25 engines.  When operating at sea level on the test stand, the cluster of four RS-25 engines will produce just over 1.6 million pounds of thrust – the same amount it will produce during the early phase of launch. During ascent, the core stage will produce a maximum thrust of over 2 million pounds.

Data, data, data

All the Green Run tests, check outs and the 100 terabytes of collected data certify the core stage design and help verify the stage is ready for launch. To put the sheer amount of data collected during Green Run into perspective, just one terabyte is the equivalent of roughly 500 hours of movies. Even the Library of Congress’s collection only amounts to a total of 15 terabytes!

Next stop: Kennedy

The next time our SLS rocket’s core stage fires up will be on the launch pad at Kennedy Space Center for the debut of the Artemis program. This inaugural SLS flight will be just the beginning of increasingly complex missions that will enable human exploration to the Moon and, ultimately, Mars.

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Flying With Fuel From Plants: The Eco-friendly Way to Go

We eat them. We make medicines out of them. Now we’re learning how to use plants as airplane fuel that helps the environment.

Using biofuels to help power jet engines reduces particle emissions in their exhaust by as much as 50 to 70 percent, according to a new study that bodes well for airline economics and Earth’s atmosphere.

All of the aircraft, researchers and flight operations people who made ACCESS II happen. Credits: NASA/Tom Tschida

The findings are the result of a cooperative international research program led by NASA and involving agencies from Germany and Canada, and are detailed in a study published in the journal Nature.

The view from inside NASA's HU-25C Guardian sampling aircraft from very close behind the DC-8. Credits: NASA/SSAI Edward Winstead

Our flight tests collected information about the effects of alternative fuels on engine performance, emissions and aircraft-generated contrails – essentially, human-made clouds - at altitudes flown by commercial airliners. 

The DC-8's four engines burned either JP-8 jet fuel or a 50-50 blend of JP-8 and renewable alternative fuel of hydro processed esters and fatty acids produced from camelina plant oil. Credits: NASA/SSAI Edward Winstead

Contrails are produced by hot aircraft engine exhaust mixing with the cold air that is typical at cruise altitudes several miles above Earth's surface, and are composed primarily of water in the form of ice crystals.

Matt Berry (left), a flight operations engineer at our Armstrong Flight Research Center, reviews the flight plan with Principal Investigator Bruce Anderson. Credits: NASA/Tom Tschida

Researchers are interested in contrails because they create clouds that would not normally form in the atmosphere, and are believed to influence Earth’s environment. 

The alternative fuels tested reduced those emissions. That’s important because contrails have a larger impact on Earth’s atmosphere than all the aviation-related carbon dioxide emissions since the first powered flight by the Wright Brothers.

This photo, taken May 14, 2014, is from the CT-133 aircraft of research partner National Research Council of Canada. It shows the NASA HU-25C Guardian aircraft flying 250 meters behind NASA's DC-8 aircraft before it descends into the DC-8's exhaust plumes to sample ice particles and engine emissions. Credit: National Research Council of Canada

Researchers plan on continuing these studies to understand the benefits of replacing current fuels in aircraft with biofuels. 

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The Science Behind the Summer Solstice

Today – Thursday, June 21 – is the summer solstice in the northern hemisphere. But what causes this change in seasons? And what exactly is a solstice? It’s all about Earth’s tilt!

Many people believe that Earth is closer to the Sun in the summer and that is why it is hotter. And, likewise, they think Earth is farthest from the Sun in the winter.

Although this idea makes sense, it is incorrect. There is a different reason for Earth's seasons.

Earth's axis is an imaginary pole going right through the center of Earth from "top" to "bottom." Earth spins around this pole, making one complete turn each day. That is why we have day and night, and why every part of Earth's surface gets some of each.

Earth has seasons because its axis doesn't stand up straight. Today, the north pole is tipped toward the Sun, and the south pole is tipped away from the Sun. The northern summer solstice is an instant in time when the north pole of the Earth points more directly toward the Sun than at any other time of the year. It marks the beginning of summer in the northern hemisphere and winter in the southern hemisphere.

To mark the beginning of summer, here are four ways to enjoy the many wonders of space throughout the season: 

1. Spot the International Space Station

As the third brightest object in the sky, the International Space Station is easy to see if you know when to look up. Sign up to get alerts when the station is overhead: https://spotthestation.nasa.gov/. Visible to the naked eye, it looks like a fast-moving plane only much higher and traveling thousands of miles an hour faster!

2.  Treat your ears to space-related podcasts

From our “Gravity Assist” podcast that takes you on a journey through the solar system (including the Sun!) to our “NASA in Silicon Valley” podcast that provides an in-depth look at people who push the boundaries of innovation, we have podcast offerings that will suit everyone’s taste. For a full list of our podcasts, visit https://www.nasa.gov/podcasts.

3. Explore space by downloading NASA apps

Our apps for smartphones, tablets and digital media players showcase a huge collection of space-related content, including images, videos on-demand, NASA Television, mission information, feature stories, satellite tracking and much more. For a full list of our apps available for download, visit https://www.nasa.gov/connect/apps.html

4. Watch launches to space

This summer, we have multiple opportunities for you to take in the sights of spacecraft launches that will deliver supplies and equipment to astronauts living aboard the International Space Station, explore our solar system and much more. Be sure to mark your calendar for upcoming launches and landings!

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Houston, We Have a Launch!

Today, three new crew members will launch to the International Space Station. NASA astronaut Jeff Williams, along with Russian cosmonauts Alexey Ovchinin and Oleg Skripochka, are scheduled to launch from the Baikonur Cosmodrome in Kazakhstan at 5:26 p.m. EDT. The three Expedition 47 crew members will travel in a Soyuz spacecraft, rendezvousing with the space station six hours after launch.

Traveling to the International Space Station is an exciting moment for any astronaut. But what if you we’re launching to orbit AND knew that you were going to break some awesome records while you were up there? This is exactly what’s happening for astronaut Jeff Williams.

This is a significant mission for Williams, as he will become the new American record holder for cumulative days in space (with 534) during his six months on orbit. The current record holder is astronaut Scott Kelly, who just wrapped up his one-year mission on March 1.

On June 4, Williams will take command of the station for Expedition 48. This will mark his third space station expedition…which is yet another record!

Want to Watch the Launch?

You can! Live coverage will begin at 4:30 p.m. EDT on NASA Television, with launch at 5:26 p.m.

Tune in again at 10:30 p.m. to watch as the Soyuz spacecraft docks to the space station’s Poisk module at 11:12 p.m.

Hatch opening coverage will begin at 12:30 a.m., with the crew being greeted around 12:55 a.m.

NASA Television: https://www.nasa.gov/nasatv

Follow Williams on Social!

Astronaut Jeff Williams will be documenting his time on orbit, and you can follow along on Facebook, Instagram and Twitter.

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Our Kepler Space Telescope team has identified 219 new planet candidates, 10 of which are near-Earth size and in the habitable zone of their respective stars. The habitable zone is the range of distance from a star where liquid water could pool on the surface of a rocky planet to possibly sustain life. This artist rendering is of one of the thousands of planets detected by Kepler beyond our solar system. These exoplanets, as they’re called, vary widely in size and orbital distances, showing us that most stars are home to at least one planet.  Learn more.

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Image credit: NASA/JPL-Caltech