Mercury reaches milestone in the evening sky, as it reaches its greatest elongation of 24 degrees east of the sun on June 4, 2020.

"For the dinosaurs, the worst-case scenario is exactly what happened ... because it put more hazardous debris into the upper atmosphere and scattered it everywhere, the very thing that led to a nuclear winter."

Cosmologists have only been able to find half the matter that should exist in the universe. With the discovery of a new astronomical phenomenon and new telescopes, these researchers say they've just found the rest.

Multiple climate factors indicate above-normal activity is most likely, according to NOAA's 2020 Atlantic Hurricane Season Outlook.

Photos - taken through telescopes, or with other optical aid - from the EarthSky community. The brightest planet Venus is now in a thin crescent phase as viewed from Earth. Venus will go between us and the sun on June 3.

History was made again Sunday, with the successful docking of SpaceX Crew Dragon with the International Space Station. Astronauts Bob Behnken and Doug Hurley are aboard. There are more activities to come, which you can watch online. Links here.

Researchers at the University of Geneva have confirmed the existence of an Earth-sized exoplanet orbiting in the habitable zone of Proxima Centauri, the closest star to our sun.

NASA’s AIM spacecraft spotted wisps of the 2020 season's 1st noctilucent, or night-shining, clouds over the Arctic on May 17.

Scientists in Europe have found that some features on Mars that were thought to be lava flows may actually have been flows of muddy water.

Scientists studying data from the Curiosity rover have found evidence for an ancient ice-covered lake in Gale Crater on Mars. The findings support the theory of alternating warmer and colder climates on early Mars.