Menu Close

Articles on Planets

Displaying 1 - 20 of 115 articles

Astronomers have found a way to estimate the number of stars in the universe. Comstock Images via Getty Images

How many stars are there in space?

Scientists have a good estimate on the staggering number of stars in the universe.
The Earth is round. Alistair Berg/DigitalVision via Getty Images

Why are planets round?

Gravity, mass and centrifugal force all contribute to the final shape of a planet.
New research suggests that Venus’ crust is broken into large blocks – the dark reddish–purple areas – that are surrounded by belts of tectonic structures shown in lighter yellow–red. Paul K. Byrne/NASA/USGS

The surface of Venus is cracked and moves like ice floating on the ocean – likely due to tectonic activity

Researchers used decades-old radar data and found that some low-lying areas of Venus’ crust are moving and jostling. This evidence is some of the strongest yet of tectonic activity on Venus.
It can stretch your mind to ponder what’s really out there. Stijn Dijkstra/EyeEm via Getty Images

Does outer space end – or go on forever?

Astronomers know a lot about what’s in outer space – and think it’s possible it never ends.
Where do the hydrogen and oxygen that make up the earth’s water come from? NASA Goddard/Flickr

Why is there water on Earth?

A recent study shows that the Earth’s water could come directly from the oxygen and hydrogen present in the rocks that formed it, and not from a late supply by asteroids.

Top contributors

More