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Total lunar eclipse of Full Worm Moon tonight, March 13-14!
Overnight on March 13-14, 2025, there will be a total lunar eclipse of the March Full Worm Moon visible from the Western Hemisphere.
March 13, 2025
The ecliptic is the path of the sun
The ecliptic is an imaginary line that marks the path of the sun. You can also find the planets and moon near this line, tracing the plane of our solar system.
January 31, 2025
Stellar luminosity versus star brightness
Some extremely large and hot stars blaze away with the stellar luminosity of a million suns! But other stars look bright only because they're near Earth.
January 18, 2025
What is a variable star?
What is a variable star? It's a star that brightens and dim in a cycle that might last hours, or weeks, or months, or longer. Astronomers know millions!
January 15, 2025
Lunar occultation of Mars on January 13, 2025. Images here!
The full Wolf Moon passed in front of red Mars for some observers last night. Here are some great images of the lunar occultation of Mars.
January 14, 2025
What is the Big Bang?
In the view of modern cosmologists, the Big Bang is the event that marked the birth of our universe. What was it - when was it - and what are modern theories?
January 1, 2025
Comets are icy balls of gas, dust and rock
Comets are diffuse balls of ice and dust orbiting the sun. They're sometimes visible in our skies. A comet's tail can stretch millions of miles across space.
November 28, 2024
Gegenschein is the glow of interplanetary dust
The gegenschein is a play of light on interplanetary dust of the solar system. It's a diffuse path of light that lies exactly opposite the sun.
November 27, 2024
Is there a North Star for Mars?
Is there a North Star for Mars ... a guide star for future explorers? Not in any satisfying way. But Martian stargazers wouldn't lack for things to see!
November 17, 2024
Mirach is your guide star to finding 3 galaxies
Mirach in the constellation Andromeda helps stargazers locate the Andromeda Galaxy, the Triangulum Galaxy, and "Mirach's Ghost" (NGC 404).
November 10, 2024
