The best opportunity to potentially see all seven planets is coming up on Feb. 28 around 6:10 p.m. ET, according to Shanahan. Mercury, which is the closest planet to the sun, would be the first to be ...

Our planet's closest and brightest neighbor will pass approximately between the Earth and sun this week, in what's called an ...

Last year, astronomers announced that a planet orbits Barnard’s star. Now, researchers have confirmed the existence of three more.

Since the planets all orbit the sun in the same plane, they can look like they are aligned in a row in the sky. "Think of stars as cars on a really distant freeway where it looks like they're not ...

For the best chances, spectators should look at the sky as soon as the sun sets. That's when the planets will make a brief appearance. Tokyo started seeing the parade first, on Feb. 22 ...