EarthSky - Earth, Space, Human World, Tonight

Why observe Earth Day on April 22?

Posted by Deborah Byrd in Earth | Human World | 20 hours ago

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

Posted by EarthSky in Earth | Today's Image | 20 hours ago

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

Posted by Deborah Byrd in Space | 2 days ago

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

Posted by Paul Scott Anderson in Space | 2 days ago

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.

Why is Easter so late this year?

Posted by Guy Ottewell in Human World | 2 days ago

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

Posted by Deborah Byrd in Astronomy Essentials | 3 days ago

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

Posted by Eleanor Imster in Earth | 4 days ago

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

Posted by Eleanor Imster in Earth | 4 days ago

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

Posted by Larry Sessions in Clusters Nebulae Galaxies | 4 days ago

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

Posted by Eleanor Imster in Human World | Space | 5 days ago

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?

Posted by Deborah Byrd in Astronomy Essentials | Human World | 5 days ago

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

Posted by Paul Scott Anderson in Space | 6 days ago

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

Posted by Eleanor Imster in Space | 6 days ago

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.

Tonight

Today's Image

Tonight

Watch for moon, Jupiter, Lyrid meteors

Watch for moon, Jupiter, Lyrid meteors

Seek a daytime moon after sunrise

The Coma Cluster of galaxies

April full moon shines in Virgo

Space

Moon’s south pole possible landing site

One comet, 70 thousand images

Closest rocky exoplanets could support life

Moon’s south pole possible landing site

The strange case of Mars' disappearing methane

Jumbo exoplanet discovered in double system with a dead star

Another asteroid disintegrates over Russia

When and how it rains on the sun

Black hole image confirm Einstein's relativity theory?

Astro Essentials

Find the Lyrid meteors' radiant point

Find the Lyrid meteors' radiant point

Why does the moon seem to follow me?

Lyrid meteor shower: All you need to know

Alpha Centauri, star system closest to our sun

Earth

Fogbow over New Mexico

Why observe Earth Day on April 22?

Favorite photos for Earth Day 2019

This Cthulhu-like creature crawled the ancient seafloor

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

Check out this peregrine falcon webcam

Fly with the world's fastest bird

Dust devil tracks on Mars, seen from orbit

Today in science: Bingham Canyon landslide

Human World

Why does the moon seem to follow me?

Why observe Earth Day on April 22?

Why is Easter so late this year?

Moon’s south pole possible landing site

Why does the moon seem to follow me?

Videos

Another asteroid disintegrates over Russia

Why observe Earth Day on April 22?

Another asteroid disintegrates over Russia

Does a year in space make you older or younger?

Check out this peregrine falcon webcam

Fly with the world's fastest bird

4-legged whale fossil found along coast of Peru

Curiosity rover captured 2 solar eclipses on Mars

Alaska's mountain glaciers: A 10-year story