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What is a penumbral eclipse of the moon?
There are 3 kinds of lunar eclipses: total, partial and penumbral. A penumbral eclipse is very subtle. You can notice a shading on the moon's face.
January 1, 2024
Geminid meteor shower 2023: Cool photos!
See the best photos of the Geminid meteor shower of 2023 from our talented community of photographers, from all over the world.
December 15, 2023
10 tips for watching the Geminids in 2023
The Geminids make up a rich and much-loved annual meteor shower that peaks in mid-December. Here are 10 tips for watching the Geminids in 2023.
December 13, 2023
How big are asteroids? Compare sizes in this video
How big are asteroids? This video shows the sizes of 22 asteroids - ranging from tiny to vast - in comparison to New York City.
November 3, 2023
Some will see a partial lunar eclipse tonight
A shallow partial lunar eclipse takes place on October 28, 2023, visible in Europe, Africa, most of Asia and western Australia. Jupiter is the bright object nearby. Maps and details here.
October 28, 2023
Guy Ottewell’s Astronomical Calendar 2024 is here
The popular and information Astronomical Calendar for 2024 by Guy Ottewell is available. It comes in either electronic or printed form. Learn more here.
September 28, 2023
Observing meteors: Top 10 tips for the Perseids
The 2021 Perseid meteor shower is rising to its peak and many are observing meteors. Here are our best 10 tips for watching this shower, or any other!
August 1, 2023
How does Earth look from outer space?
How does Earth look from space? You could see it from Neptune, but it's brighter from closer locations. Spacecraft photos tell the tale.
July 14, 2023
What are gravitational waves? Ripples in spacetime
First postulated by Albert Einstein in 1916 but not observed directly until September 2015, gravitational waves are ripples in spacetime.
June 29, 2023
Geminid meteor mystery solved? It was a collision!
Data from the Parker Solar Probe helped scientists discover that the Geminid meteor shower is most likely the result of a violent event on asteroid Phaethon.
June 25, 2023
