What Is Earth Made Of?

Earth has multiple layers, consisting of the core, mantle and crust.

What is the Temperature of Mars?

Mars is a very cold planet. Temperatures don't get much above 70 degrees F and they can get down to nearly minus 200 degrees F.

Sierra Nevada Satisfied with Dream Chaser Glide Test

Executives with Sierra Nevada Corporation said Nov. 13 they believed the recent glide flight of a Dream Chaser test article was successful and they won't need to fly that vehicle again.

Zwicky Transient Facility First Light

A gallery if images from the Zwicky Transient Facility's (ZTF) first view of the universe, and its ultra-wide-field camera, based at the Palomar Observatory.

What is Dark Matter?

Dark matter emits no light, and cannot be directly observed, but scientists think that it and dark energy make up most of the mass of the universe.

Does the Moon Rotate?

Yes, the moon rotates on its axis. The moon's rate of rotation nearly matches its orbital period, which keep the same side facing Earth.