Dark matter is a hypothetical form of matter that is implied by gravitational effects that can't be explained by general relativity unless more matter is present in the universe than can be seen. It ...

To live on the moon or Mars, humans will need heat and air conditioning that can operate long term in reduced gravity and temperatures hundreds of degrees above or below what we experience on Earth.

Root explores how Earth’s gravity field is constantly changing and what these variations reveal about our planet ...

How can it be that the Moon's mass is a little over 1 percent of Earth's mass, while its gravity is about 17 percent of Earth ...