EarthSky | The 5 petals of Venus and its 8-year cycle

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The 5 petals of Venus and its 8-year cycle

Learn about the 8-year cycle of Venus in our sky and the petals of Venus, a rhythmic motion of Venus when viewed from an Earth-centered perspective.

Guy Ottewell

January 22, 2023

What makes a giant sunspot?

A giant sunspot - AR 3190 - is crossing the face of the sun this week. It'lll soon disappear, but is still visible as of January 21, 2023. What makes it?

C. Alex Young

January 21, 2023

Meet ChatGPT, your new AI best friend

ChatGPT is a chatbot that uses artificial intelligence to generate text in answer to questions or writing prompts. Read examples here.

Kelly Kizer Whitt

January 19, 2023

On Saturday … Closest new moon in 1,337 years

The new moon of January 21, 2023 will be the closest new moon to Earth in a period of 1,337 years. Read more about the closest new moon here.

EarthSky Voices

January 19, 2023

Discovery of opal on Mars boosts chances for life

NASA's Curiosity rover has found water-rich opal on Mars. Its presence indicates that there was an extensive and potentially habitable subsurface environment.

Paul Scott Anderson

January 19, 2023

Moon near Mercury on January 19

No matter where you live worldwide, look for the thin crescent moon near Mercury on the morning of January 19, 2023. The fiery red star Antares is nearby.

Marcy Curran

January 18, 2023

The green comet: Comet 2022 E3 ZTF

Learn about the trajectory of the green comet - Comet 2022 E3 ZTF - by the renowned astronomer Guy Ottewell. The comet will be closest to Earth on February 2.

Guy Ottewell

January 17, 2023

Milky Way’s farthest stars reach halfway to Andromeda

Astronomers have discovered the Milky Way's farthest stars in our galaxy's huge stellar halo. The most distant stars are almost halfway to the Andromeda galaxy.

Paul Scott Anderson

January 17, 2023