Why observe Earth Day on April 22?

April 22 is the date of Earth Day in part because of Arbor Day, an earlier observance. The focus of Earth Day 2019 is protection of Earth species.

Favorite photos for Earth Day 2019

Here’s a collection of wonderful photos from the EarthSky community in celebration of Earth Day 2019. Thank you all!

One comet, 70 thousand images

Scientists released the OSIRIS Image Viewer to make the amazing images of comet 67P – acquired by the Rosetta spacecraft – easily accessible on the internet.

Closest rocky exoplanets could support life

Intense UV radiation from red dwarf stars was thought to make potentially habitable exoplanets unable to support life. But a new study of the 4 nearest rocky worlds suggests otherwise.

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Why is Easter so late this year?

Easter is this Sunday. Astronomer Guy Ottewell explains why it’s a late Easter, but not the latest it can be.

Find the Lyrid meteors’ radiant point

You don’t need to find the radiant to see the meteors. But it’s fun to spot, near the bright star Vega.

This Cthulhu-like creature crawled the ancient seafloor

Paleontologists have named the 430 million-year-old fossil of a tentacled sea creature after horror author H.P. Lovecraft’s Cthulhu monster.

Ancient ‘Texas Serengeti’ had rhinos, alligators, 12 kinds of horses

A new study of fossils unearthed by Depression-era workers reveal that camels, antelopes and relatives of modern elephants and dogs were among the animals that roamed a veritable “Texas Serengeti” millions of years ago.

The Coma Cluster of galaxies

The Coma Cluster is one of the richest galaxy clusters known. How many suns and how many worlds might be located in this direction of space?

Moon’s south pole possible landing site

NASA hopes to send astronauts to the surface of the moon in 5 years, and has planned a landing site where no human has yet been: the lunar south pole.

Why does the moon seem to follow me?

Here’s something you – or your kids – might have noticed: When you’re in a moving car, earthly objects get left behind, but the moon seems to follow. Why?

The strange case of Mars’ disappearing methane

In 2013, in a big success story, a Mars rover and orbiter made a near-simultaneous observation of methane in Mars’ atmosphere. Now a newer mission orbiting Mars – ESA’s Trace Gas Orbiter – has failed to detect methane. Why?

Jumbo exoplanet discovered in double system with a dead star

The giant exoplanet – 13 times more massive than Jupiter – is the first yet found that orbits a binary star system in which 1 of the 2 stars is dead.