No matter where you go in space, the background temperature stays nearly the same.
Photo Credit: NASA
Everything we can see-stars, planets, and galaxies-makes up only 5% of the Universe.
Photo Credit: NASA
The Universe was born 13.82 billion years ago when all matter, energy, space-and even time erupted into existence in a titanic fireball called the Big Bang.
Photo Credit: NASA
Most of the stuff in the Universe has repulsive gravity.
Photo Credit: NASA
Solar neutrinos are a by-product of sunlight-generating nuclear reactions.
Photo Credit: NASA
The first-ever gravitational waves detected originated from a binary black hole system that no one had predicted.