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60% of bird species came from Australia
All perching birds - the majority of the world’s bird population - originated in Australia, researchers report.
April 4, 2019
Farewell old moon, hello Mercury
Many in the EarthSky community caught the brightest planet Venus and the very old moon - a waning crescent in the east before the sun - this week. Some also caught elusive Mercury near the moon.
April 4, 2019
Did deep groundwater cause these mysterious dark streaks on Mars?
Mars is a cold, dry desert, but a new study provides tantalizing evidence for liquid water deep below its surface. If it exists, this Mars groundwater might cause the weird dark streaks in Martian craters and canyons.
April 3, 2019
See Mars via images from ExoMars orbiter
These images from ESA's ExoMars orbiter show Mars in all of its diverse geological wonder. Also, if you look carefully, you can spy NASA's newest Mars mission, the InSight lander!
April 3, 2019
See it! Mars meets the Sisters
Red Mars has been exceedingly close - and is still close - to the Pleiades star cluster, aka the Seven Sisters. These EarthSky Community photos show them in the west after sunset, where you can see them for some nights to come.
April 2, 2019
Astronomers find 2nd galaxy lacking dark matter
Dark matter theory - the idea that a huge fraction of our universe exists in a form we can't see - is a cornerstone of modern cosmology. Ironically, galaxies lacking dark matter might help confirm the theory.
April 2, 2019
2018 global CO2 growth 4th highest on record
According to NOAA data, global growth in atmospheric carbon dioxide (CO2) in 2018 was the 4th-highest in 60 years of record-keeping.
April 2, 2019
Speedy asteroid buzzed Earth last week, 1 day before being detected
A small asteroid - now designated as 2019 FC1 - flew closer to us than the moon on March 28, 2019. Astronomers detected it 1 day later. It's the largest of 14 asteroids to pass closer to us than the moon since 2019 began.
April 1, 2019
Saturn’s rings coat 5 tiny moons
New findings from Cassini - which orbited Saturn from 2004 to 2017 - confirm that dust and ice from Saturn's rings accumulate on moons orbiting in the rings' vicinity.
April 1, 2019
NASA and Google partner on Mars exploration
Devon Island in the Arctic is one of Earth's most Mars-like places. NASA is there, training scientists and testing technologies for future Mars exploration. Now Google has joined in, to bring Devon Island's Mars-like wonders to you.
March 31, 2019
