Hi, we’re NASA engineers working on space communications technologies that will help create an interplanetary internet. When data travels vast distances like the 30+ million miles to Mars, the potential for delay or disruption is significant! Network disruption in space can happen because of limited contact time and atmospheric effects. NASA communications technology called ‘disruption-tolerant networking’ (DTN) allows for temporary disruptions and long delays, unlike the familiar computer to computer IP connection. DTN can also provide tremendous benefits to missions closer to Earth and terrestrial applications. That’s what we’re working on, and it has the potential to improve data transmission for virtually all of NASA’s missions. We are: Vint Cerf, Distinguished Visiting Scientist, NASA’s Jet Propulsion Laboratory Dave Israel, Exploration and Space Communications Architect, NASA’s Goddard Space Flight Center Adam Schlesinger, Technical Lead, Advanced Exploration Systems Delay/Disruption Tolerant Networking Project, NASA’s Johnson Space Center Scott Burleigh, Principal Engineer, NASA’s Jet Propulsion Laboratory Kelvin Nichols, International Space Station ground systems engineer, NASA’s Marshall Space Flight Center Dr. Keith Scott, The MITRE Corporation For more information on disruption-tolerant networking, visit: https://www.nasa.gov/content/dtn Don’t forget to follow us on Twitter at @NASA_TDRS, @NASALasercomm and @NASASCaN!

Hi Reddit! My name is Gavin Schmidt. I am a climate scientist and Director of the NASA Goddard Institute for Space Studies. I work on understanding past, present and future climate change and on the development and evaluations of coupled climate models. I have over 100 peer-reviewed publications and am the co-author with Josh Wolfe of “Climate Change: Picturing the Science,” a collaboration between climate scientists and photographers. In 2011, I was fortunate to be awarded the inaugural AGU Climate Communications Prize and was also the EarthSky Science communicator of the year. I tweet at @ClimateOfGavin. My name is Reto Ruedy and I am a mathematician working as a Scientific Programmer/Analyst at the Goddard Institute for Space Studies. I joined the team that developed the GISS climate model in 1976, and have been in charge of the technical aspects of the GISS temperature analysis for the past 25 years. You can read more about the NASA 2015 temperature analysis here (or here, here, or here). You can also check out the NOAA analysis — which also found 2015 was the warmest year on record. We’ll be online at 1 pm EST (10 am PST, 6 pm UTC) to answer your questions — Ask Us Anything! UPDATE: Gavin and Reto are on live now (1:00 pm EST) Looking forward to the conversation. UPDATE: 2:02 pm EST - Gavin and Reto have signed off. Thank you all so much for taking part!

Hello r/science! From space, NASA has been keeping an eye on Earth’s energy supply from the Sun for more than 40 years. For a long time, scientists assumed the Sun’s energy output was unwavering, they called it the ‘solar constant.’ But, by the 1980s, we learned that solar energy reaching Earth was not constant, and fluctuates with solar activity on a roughly 11-year cycle. This change in the total solar irradiance is just one of the Sun’s influences on Earth’s atmosphere, weather, and climate. We are here to talk all things TSIS-1 and Sun-Earth interactions. Joining you today will be: Peter Pilewskie, professor of ocean and atmospheric science, Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder Dong Wu, Earth scientist NASA Goddard Space Flight Center Doug Rabin, solar physicist at NASA Goddard Space Flight Center Jae Lee, Earth Scientists at NASA Goddard Space Flight Center Candace Carlisle, Project Manager TSIS-1 at NASA Goddard Space Flight Center Charles Ichoku, NASA Earth Scientist We’ll be back to answer your questions at 3 pm ET (12 PT), Ask Us Anything!

At NASA, we use the vantage point of space to study Earth and the life it contains. And, so far, our planet is the only one with life (that we know of). The more we learn, the more this question comes into focus: Maybe Earth is the weird one? As we begin the search for alien life, the knowledge and tools NASA developed to study Earth are among our greatest assets. We will discuss how Earth science informs the search for life beyond our planet – on exoplanets and even within our own solar system. So, what do you want to know? We will be back at 4 pm ET to answer your questions, AMA! Morgan Cable is a NASA research scientist searching for life and interesting chemistry on ocean worlds such as Saturn’s moons Enceladus and Titan. Tony Del Genio is a NASA Earth climate scientist and planetary scientist who uses global climate models to understand the kinds of exoplanets that are most likely to be suited to the emergence of life as we know it. He once thought planets orbiting other stars wouldn’t be found in his lifetime, but now he tries not to underestimate exoplanet scientists. Shawn Domagal-Goldman is an astrobiologist at NASA who looks for ways to identify signs of life, and ways to detect those signs from far away using space-based telescopes. Stephen Kane is a planetary astrophysicist at the University of California, Riverside, who has been researching exoplanets for more than 20 years. Andrew Rushby is a NASA astrobiologist who uses computer simulations to try and understand those few planetary environments that could support life in the deathly cold, vacuous expanse of our galaxy. UPDATE @ 3:24 pm ET: A new feature story and video on this topic are now posted at nasa.gov – https://www.nasa.gov/feature/jpl/our-living-planet-shapes-the-search-for-life-beyond-earth UPDATE @ 3:49 pm ET/1:49 pm MT: We are online and ready to start answering questions! In fact, we are all together in Laramie, Wyoming at the Habitable Worlds 2017 workshop. Looking forward to this! https://twitter.com/NASAEarth/status/930903145923989504

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