Space
The End of Everything, LIVE, with Katie Mack
Join EarthSky's Deborah Byrd and theoretical cosmologist Katie Mack at 17:15 UTC (12:15 p.m. Central) on Monday, June 24, as they discuss the end of everything!
Sun
Sun news June 24: Super sunspot returns with almost-X flare
Sun news for June 24, 2024. Former sunspot region AR3697 is back as AR3723, producing an almost-X M9.3 flare off the western limb (edge).
Astronomy Essentials
Tonight

Visible planets and night sky guide for June

Visible planets and night sky guide for June 2024. The year's latest sunsets come after the longest day (the solstice). Why?
Brightest Stars

Zubenelgenubi is alpha star of Libra the Scales

Zubenelgenubi - Alpha Librae - is a double star, and is the second brightest star in the constellation Libra the Scales.
Today's Image

Meet an omega sunset and sunrise

An omega sunset or sunrise is an inferior mirage. It's produced by a layer of warmer and less dense air close to an ocean surface.
Earth

Lightning safety: Here’s what you need to know

Read up on lightning safety tips. Do you know whether it's safe to be at the beach in a lightning storm? How about a golf cart? Do rubber tires make you safe?
Favorite Star Patterns

Summer Triangle: Star pattern of the season

On June and July evenings, you’ll find the Summer Triangle in the east at nightfall. It swings high overhead after midnight and sits in the west at daybreak.
Astronomy Essentials

Latest sunsets follow the summer solstice

Latest sunsets around now for 40 degrees north latitude. Latest sunrises around now for 40 degrees south latitude. Plus, a word about twilight.
Earth

Large wildfires create fire weather: A vicious loop

Large wildfires create fire weather, resulting in a vicious loop. The fires create dark clouds of soot that increase temperatures and dry out the atmosphere.
Space

Did colliding dark matter shape the El Gordo galaxy cluster?

Analysis of El Gordo galaxy cluster's behavior suggests it might be a result of self-interacting dark matter. It may give insight into dark matter's nature.