Four of Earth’s neighbors are about to appear in a planetary alignment. Those four planets — Mercury, Venus, Neptune and ...

April’s planetary parade has fewer planets. Only four will line up: Venus, Saturn, Mercury and Neptune. April's parade of ...

Q: Why do the planets all orbit the Sun in the same plane? —Randi Eldevik | Stillwater, Oklahoma Because of the way the Sun formed, explains David DeVorkin, a senior curator in the space history ...

Four planets in the solar system are about to appear in alignment in the night sky. Here's how stargazers will be able to see ...

When visualizing the Snapchat Solar System, imagine yourself as the sun ... person on the list has an Earth badge, and so on.

Read on to learn about the planets and luminaries' significance and their respective effects on your daily lives. iStockphoto/Getty The sun is a luminary, considered the greatest beacon in our ...

Combining with one other previously confirmed planet, one of our closest stellar neighbors now has a family of four.

Narrator: As the solar system grew, four rocky planets: Mercury, Venus, Earth and Mars, were created closest to the Sun. Made of rocks and metals, they have solid surfaces and a central core of ...

Over 112 nights during a three-year period, the telescope detected subtle shifts in the movement of Barnard's Star in order to "tease apart the number and masses of the planets that must be ...