Astronomy Essentials
Perseid meteor shower 2021: All you need to know
In 2021, the peak mornings for the Perseid meteor shower - August 11, 12 and 13 - will be moon-free. Now all you need is a dark sky!
Astronomy Essentials
Delta Aquariid meteor shower 2021: All you need to know
Late July presents a nominal peak for the Delta Aquariid meteor shower, but this long and rambling shower is active from July 12 to August 23 each year.
Astronomy Essentials

Find Perseid and Delta Aquariid radiant points

Every late July and August, two excellent meteor showers overlap. Here's how to find the Perseid and Delta Aquariid radiant points.
Today's Image

Visualize the Perseid meteor stream in space

This visualization by Ian Webster and Peter Jenniskens uses NASA data to render the Perseid meteor stream in space. Don't miss this!
Human World
Space

9 weird transients from 1950 still unexplained

Astronomers in Sweden want to solve the mystery of 9 weird transients, glimpsed in a photographic plate acquired at Palomar Observatory in 1950.
Space

Cracked surface of Venus behaves like sea ice

Venus' cracked surface suggests a moveable crust for this nearby world, and suggests the planet might still be geologically active today.
Astronomy Essentials

Ecliptic is the sun’s path in our sky

The ecliptic is the path the sun takes across our sky. It's the Earth-sun plane, and, more or less, the plane of our solar system.
Earth

Dinosaurs already in decline before asteroid?

Life was already getting harder for dinosaurs before an asteroid wiped them out.
Tonight

Full moon, Saturn, Jupiter July 23 to 26

The full moon, Jupiter, Saturn ... what could be better? Watch as they light the night from dusk until dawn on July 23 to 26, 2021.
Earth
Today's Image

Wildfire smoke blankets North American skies

Wildfire smoke from Canada and the western United States has blanketed North America this week. See photos and video.