It has everything to do with the tricky, daunting way the probe will punch through to the surface.
Find out everything there is to know about astronauts and stay updated on the latest space news with the comprehensive articles, interactive features and space pictures at LiveScience.com. Learn more about these fascinating scientists as they continue to make amazing discoveries.
As wildfires continue to burn in California, new satellite photos show the sheer scale of the deadly Camp Fire that has devastated the state's northern town of Paradise.
A NASA scientist actually spotted two sharp-cornered icebergs during a recent research flight over Antarctica.
Astronaut Harrison Schmitt saw Earth from space, but doesn't see that human activity is shaping climate change.
Sometime after 4:40 am Eastern, something went wrong with a rocket booster carrying two people to the International Space Station.
There's something out there that physicists have never seen before, and it's coming up from the bottom of the Earth. Scientists think it's a brand-new particle.