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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!
July 26, 2021
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.
July 26, 2021
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!
July 26, 2021
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.
July 25, 2021
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.
July 25, 2021
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.
July 25, 2021
Earth
Dinosaurs already in decline before asteroid?
Life was already getting harder for dinosaurs before an asteroid wiped them out.
July 24, 2021
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.
July 23, 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.
July 23, 2021
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