planets

Why do some planets have moons? A physics expert explains why Earth has only one moon, while other planets have hundreds

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On Earth, you can look up at night and see the moon shining from hundreds of thousands of miles away. But if you go to Venus, it wouldn’t be like that. Not every planet has a moon – so why do some planets have several moons while others have none? I’m a physics instructor who … Read more

Identify a plant that can grow on Mars

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A future civilization on Mars may be accompanied by a very special and resilient little plant. A type of moss found in the desert – called Syntrichia caninervis— may be able to survive and grow in the harsh Martian environment, according to a new paper in the journal INNOVATION. This moss can grow in temperatures … Read more