In the frozen outskirts of the solar system, a reddish dwarf planet orbits in silence. Known as Sedna, it is so distant that one trip around the Sun takes more than 11,000 years. For much of that time ...

How does a cloud stay cool under direct sunlight––or seem to vanish in infrared? In nature, phenomena like white cumulus ...

Supernovae, these gigantic stellar explosions, release a phenomenal amount of energy. This energy travels through space, capable of reaching planets located thousands of light-years away.