Researchers say they've identified the cleanest air on the planet - free from particles caused by human activity - over the Southern Ocean, which surrounds Antarctica.

This faint comet - Comet C/2019 U6 (Lemmon) - is headed toward its perihelion, or closest point to the sun, on June 18. It's currently visible from the Southern Hemisphere, via strong binoculars, with a dark sky.

The formation of the sun, the solar system and the subsequent emergence of life on Earth may be a consequence of a collision between our galaxy - the Milky Way - and a smaller galaxy called Sagittarius.

The moon will look full on June 4 and 5, 2020. We in the Northern Hemisphere will call it the Strawberry Moon. It'll shine near the star Antares. It'll undergo a very faint penumbral lunar eclipse.

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.