To unambiguously settle the questions of whether there was life on Mars, it will take scientists down on the surface. Download Download Share on Facebook Share on Twitter Rotate quotes life mar question
Communication is an issue where we can improve, and if I can do anything to help, I am happy to. Ellen Stofan communicationhappyimprove Change image and share on social
I'm so biased to this issue of the origins of life and the limits of life. Ellen Stofan biasissuelife Change image and share on social
Water-based life is very much an Earth-centric view, and we can push the envelope on that here in our own solar system. We have the methane seas of Titan. Ellen Stofan basecentricearth Change image and share on social
To ask questions can become the laziest and wobbliest occupation of a mind, but when you must yourself answer the problem that you have posed, you will meditate your question with care and frame it with precision. James Stephens answercareframe share on social
Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap. Henry Spencer basisbuycheap share on social
If you're not having a good time, find something else that gives you some joy in life. Penny Marshall findgoodjoy Change image and share on social