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Hundreds of unexpectedly energetic objects have been discovered throughout the distant universe, possibly hinting that the cosmos was far more active during its infancy than astronomers once believed. Using deep-field

This article was originally published at The Conversation. The publication contributed the article to Space.com’s Expert Voices: Op-Ed & Insights. While the dangerous effects of climate change continue to worsen,

Mercury may be small, but it’s mighty, zipping around the Sun faster than any other planet. And despite being so close to the sun, it’s not the hottest planet. Venus

Warm mid-August summer nights offer prime conditions for spotting three magnificent star clusters visible to northern-hemisphere skywatchers in the coming months. Star clusters are gravitationally bound groups of stars that

When NASA’s New Horizons spacecraft sped by Pluto in 2015, it revealed an incredible world of ice and haze carved by various geological processes — hinting that an ocean may

What do many baked goods and the planet Mercury have in common? They shrink as they cool. Evidence suggests that since it formed about 4.5 billion years ago, Mercury has

From Jupiter’s swirling storms to Neptune’s icy depths, planets across our solar system are orbited by a fascinating cast of moons. Some are massive and geologically active, while others are