In 1977, NASA launched the Voyager 1 and its twin probe, Voyager 2, during a rare planetary alignment that occurs only once ...

Voyager 1 and 2 traveled billions of miles to reach the heliopause, showing how the Sun's magnetic influence marks the ...

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When a meteor streaks across the sky, it's not just beautiful. It's nature's way of delivering a time capsule to Earth.

Approximately 4.5 billion years ago, a cold cloud of gas and dust buried deep in one of the Milky Way galaxy’s spiral arms started to collapse. From there, gravity worked its magic. The cloud began to ...

A pair of theoretical physicists are reporting that the same observations inspiring the hunt for a ninth planet might instead be evidence within the solar system of a modified law of gravity ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. The size of the solar system is defined by the volume ...

The telescope would piece together images of an alien world. You might be forgiven for being a bit worn down with the news of late. One story is dominating the headlines right now, and with good ...