The Solar System
In the Solar System Channel, you can explore the planets and celestial objects around our own sun. Learn about topics such as Mars, Jupiter and the Moon.
Astronomers Tell You How and Where to Best View Meteor Showers
How to Find Orion's Belt in the Night Sky
Radio Telescope Image Gallery
How do I build a telescope at home?
Shooting the Stars as an Astrophotographer
Twinkle, Twinkle: The Ultimate Stars Quiz
White Dwarfs Can Shred Planets to Pieces
Why Do Stars Twinkle?
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Early dark energy, a form of dark energy that may have existed a few hundred thousand years after the big bang, could help clarify the universe's rate of expansion. But its existence hasn't been proven.
You've probably heard that staring at the sun is bad — even a few seconds can damage your eyes. But what if you looked at a solar eclipse?
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?
By Robert Lamb
If I was on the moon and the earth was black (no lights were on) and a flashlight was turned on facing the moon, would I see the light? If I couldn't, would there be any way to detect any residual matter that came from the light on Earth or does light die after a certain distance?
Where I live it is pretty common to see "shooting stars" -- streaks of light in the sky at night. How big is a shooting star? Do they land on earth or do they burn up? Do they land on the ground as meteorites?
If "nature abhors a vacuum," then why doesn't the vacuum of space suck away all of the Earth's atmosphere?
Can the curvature of the Earth only be seen from outer space? If you didn't know that the Earth is a sphere, there are three common observations you could use to convince yourself that it is.
The Chandler wobble is the change in the spin of Earth on its axis. Think of the wobble you see in a toy top when it first starts spinning or slows down. Its 'poles' do not spin in a perfectly straight line.
Until recently, most people assumed that if Mars had liquid water, it no longer did and hadn't for quite some time. But scientists have recently noticed some anomalies in photos of Mars that may suggest there is water. Could there be life, too?
The moon has seen a lot in its 4.5 million years of life, and this detailed geologic map serves as testament.