The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

IT starts with a glimmer in the sky – just a pinprick of light, barely distinguishable from the stars. But this is no distant ...

Mercury has had enough of the sun's solar flares, so he goes to Venus to share his orbit. But is this such a good idea?

According to Star Walk, "the next time seven planets will align (after Feb. 28, 2025) is likely to be around late 2028." The ...

A nearly new moon and mostly clear skies will present near ideal viewing conditions for the planet parade through Feb. 28.

Mars, Venus, Jupiter, Saturn and Mercury will shine bright enough for the naked eye to see, and you can catch glimpses of Uranus and Neptune with binoculars or a telescope.

The last week of February holds a special celestial treat in store for astronomers and amateur stargazers. Mercury will become the seventh planet to line up in a current “planetary parade” that’s ...

A rare full seven-planet alignment will be visible in the early night sky between Feb. 22 and 28. We have the tips you need ...

Read Earth is immersed in material streaming from the Sun. This stream, called the solar wind, is washing over our planet ...

How does a compass work in space? From the moon to Venus, here’s how a compass would work beyond Earth’s magnetic field.

A star racing through the Milky Way may have a planet in tow, setting a new speed record for exoplanet systems. Using microlensing, astronomers spotted the pair moving at over 1.2 million mph.