It wasn't so long ago that astronomers thought the universe contained normal matter, or baryonic matter, the base unit of which is the atom. But when it comes to the cosmos, there's always more than meets the eye. What else is hanging out in space?
WHAT'S INSIDE: ASTRONOMY
- The Solar System
Explore These Topics:
- How big does a meteor have to be to make it to the ground?
- Why does the moon look so much bigger when it is near the horizon?
- Jupiter Explained
- Can the curvature of the Earth only be seen from outer space?
- If nature abhors a vacuum, then why doesn't the vacuum of space suck away all of the Earth's atmosphere?
The changing phases of the moon have given us an enduring curiosity about the dark side of the moon. But is there really a dark side of the moon? What would we see there?
We can't defy the odds of an asteroid taking a turn for Earth forever, so the world's astronomers watch the sky. What happens once they spot something?