A stunning photo of a "parade of planets", shows Mars, Jupiter, Uranus, Saturn, Venus, Neptune, and Mercury in alignment from ...

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball, about ...

The line around which something spins is called an axis. The Earth's axis is tilted at an angle ... Winter is when the northern hemisphere (where we live) is tilted away from the Sun.

Seven planets will line up for a rare "planetary parade" today (Feb. 28) and you can watch it live online, beginning at 12:00 p.m. ET (1700 GMT).

You may have seen a string of lights in the night sky overnight, but what are these lights and why are they in a straight line? The train of lights in the sky is not drones; rather, they are from ...

Night falls when the Earth spins around so far that we face away from the Sun. If you imagine a line running between the North and South Poles, the Earth rotates about this line, called an axis.