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Space
Ice volcanoes on Ganymede? New promising candidates found
Are there ice volcanoes on Ganymede? A new international study reveals several good candidates on Jupiter's large ocean moon.
May 21, 2026
Space
Searching for Earth-sized exoplanets with the POET mission
In 2029, Canada's POET mission will start searching for Earth-sized exoplanets as well as super-Earths. It will focus on smaller, cooler stars like red dwarfs.
May 21, 2026
Sun
Sun news: Fiery active regions on the far side of our sun
Sun news for May 21, 2026: The far side is hiding some fiery active regions. Images from the Perseverance rover on Mars show what's coming our way.
May 21, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for May
Visible planets and night sky guide. Watch a video with EarthSky's Deborah Byrd about the upcoming conjunction of the 2 brightest planets, Venus and Jupiter.
May 21, 2026
Earth
Cumulonimbus clouds bring thunderstorms: How to spot them
Cumulonimbus clouds, sometimes called thunderheads, are towering formations that can bring severe storms such as hail, lightning, flooding and tornadoes.
May 21, 2026
Earth
Synchronous fireflies light up these national parks
The synchronous fireflies are back! These lightning bugs flash in harmony in the Great Smoky Mountains and other nearby parks from mid-May to mid-June.
May 20, 2026
Space
Psyche mission images of Mars flyby are here!
Psyche mission images of the Mars flyby are now here! See them here and read more about what Psyche learned as it passed the red planet.
May 20, 2026
Astronomy Essentials
Constellations and signs: What’s the difference?
What is the difference between the signs of the zodiac and the constellations of the zodiac? Astronomer Guy Ottewell illustrates and discusses this difference.
May 20, 2026
Space
Interstellar turbulence in the Milky Way distorts light
For the 1st time, astronomers have directly detected how interstellar turbulence distorts the light from distant objects in our galaxy.
May 19, 2026
Tonight
Find the Keystone in Hercules, and the Hercules Cluster M13
Let the bright star Vega guide you to a famous star pattern in Hercules - called the Keystone - and then to the Hercules Cluster, aka M13.
May 19, 2026
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