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The night sky in the time of the dinosaurs
The night sky in the time of the dinosaurs would have looked much different than today’s. Some famous stars had not yet been born. Read more.
April 14, 2026
Ancestors of mammals laid eggs, says new fossil evidence
Scientists discovered a 250-million-year-old Lystrosaurus fossil that was still in its egg. It showed ancestors of mammals laid eggs.
April 14, 2026
Coma Berenices galaxy cluster, best in April and May
Myriads of galaxies - in all shapes and sizes and visible only in telescopes - shine in the Coma Berenices galaxy cluster.
April 14, 2026
The tree-kangaroo lives in the hidden world of the treetops
The tree-kangaroo lives high in the rainforest canopy, leaping, climbing and revealing a surprising side of marsupial life few have seen.
April 13, 2026
Universe’s expansion rate: ‘Something doesn’t add up’
We think we understand the local universe's expansion rate. But measurements confirm a mismatch that could point to a need for new physics.
April 12, 2026
International Dark Sky Week is April 13 to 20
Celebrate dark night skies and limit light pollution by raising awareness with International Dark Sky Week, April 13 to 20, 2026. Find links here.
April 12, 2026
Why do Jupiter’s large moons outnumber Saturn’s?
Jupiter's large moons - Ganymede, Callisto, Io and Europa - number four. But Saturn has just one large moon, Titan. Why? It may be the planets' magnetic fields.
April 12, 2026
Supermassive black holes could merge in 100 years
For the first time, astronomers have direct evidence of a close pair of supermassive black holes in a galaxy. These black holes could merge in 100 years.
April 10, 2026
The Year Without a Summer: The chaos of 1816
1816 was The Year Without a Summer, following the eruption of Tambora in 1815. The haze was so thick, people could see sunspots with their eyes alone.
April 10, 2026
Looking for sky almanacs? EarthSky recommends …
Here are some almanacs that show you the rising and setting times for the sun, moon, planets and satellites in your sky.
April 10, 2026
