Solar System Billions of years from now, what will be the fate of our Sun? Would it be a hard surface we could walk on?
Stars How do astronomers make generalizations about the ages of stars, galaxies, and other celestial objects?
Cosmology What are gravitational waves, and what do they have to do with the Big Bang? Can scientists detect them?
Robotic Spaceflight When we send spacecraft to the outer gaseous planets, how do they survive the trip through the asteroid belt between Mars and Jupiter?
