Enjoying EarthSky? Subscribe.

263,365 subscribers and counting ...

Search Results for: 891

Come to know the Big and Little Dippers

The Big Dipper is easy. And, once you find it, you can find the Little Dipper, too.

What are star trails, and how can I capture them?

When a camera captures a star’s movement across the sky, it’s called a star trail. An astrophotographer explains how he does it.

When is the next supermoon?

We’ve just passed a series of 3 full supermoons. The next supermoons of 2018 will be the new moons of June, July and August.

Moon near Aldebaran January 26 and 27

Will you see Aldebaran in the moon’s glare on January 26 or 27, 2018? Plus … the story of Aldebaran when it was part of a double pole star.

Astronomers detect whirlpool movement in earliest galaxies

Astronomers looked back to a time only 800 million years after the Big Bang and found whirlpool shapes in small, very young galaxies.

New year’s comets

Will 2018 give us a bright comet? There are a couple of possibilities. In the meantime, here are some photos of comets, visible through telescopes, as 2018 begins.

NASA spacecraft spies electric-blue clouds over Antarctica

These noctilucent, or night-shining, clouds are seeded by debris from disintegrating meteors. They glow electric blue when they reflect sunlight.

See it! High tides and winter storms

High tides followed Monday’s supermoon, as Storm Eleanor plowed into Europe. Then a “bomb cyclone” hit the U.S. East Coast. Photos here showing winter’s power and terrible beauty.

10 places to find snow beyond Earth

From NASA, here are 10 snowy or icy worlds beyond our own.

Latest sunrises happen in early January

Shortest day on solstice, but latest sunrises in early January at mid-northern latitudes. Southern Hemisphere? Your latest sunsets are around now.

See it! December’s full supermoon

December’s full supermoon was the closest and brightest full moon of 2017. Wonderful photos here from the EarthSky community around the world.

Watch ISS spacewalk October 20

Friday’s is the last of 3 spacewalks by International Space Station astronauts this month.

Red sprite over Oklahoma

Photographer Paul Smith said he thinks this may be the 1st documented capture of a red sprite over Oklahoma. They’re large-scale electrical discharges – high above thunderstorm clouds – flickering in the night.

What’s the birthstone for October?

Happy birthday October babies! Your birth month has two birthstones – opal and tourmaline.

Moon next to Saturn on September 26

Look for Saturn near the moon on September 26. Would Saturn really float on water? Facts here.

Day and night exactly equal at equinoxes?

On the day of an equinox, the center of the sun would set about 12 hours after rising – given a level horizon, as at sea, and no atmospheric refraction.

Cassini milestones before the final plunge

Milestones for Cassini’s final week at Saturn. Today’s distant flyby of the large moon Titan will slow down the spacecraft enough so that – on Friday – Cassini will make its final plunge into Saturn’s atmosphere.

Capricornus? Here’s your constellation

No matter where you live worldwide, Capricornus the Sea-goat climbs highest in the sky in early September. How to see it, and how a sea-goat came to reside among the stars.

Hidden river once flowed under Antarctica

“Ice, by itself, is only capable of flowing at velocities of no more than tens of meters per year. That means the ice is being helped along. It’s sliding on water or mud or both.”

Largest-ever Gulf of Mexico dead zone

For 32 years, scientists have tracked the oxygen-depleted waters that appear each summer in the Gulf of Mexico. This year’s dead zone is the biggest yet.

Science balloons soaring on new missions

NASA’s Balloon Program is preparing new missions, including one designed to investigate the birth of our universe.

Sagittarius? Here’s your constellation

How to find Sagittarius on August evenings, plus the lore and science of this constellation.

Eltanin and Rastaban, the Dragon’s Eyes

These two famous stars shine down from the northern sky. Eltanin and Rastaban represent the fiery Eyes of the constellation Draco the Dragon.

Top tips for binocular stargazing

Whether you’re a beginning stargazer or a veteran of thousands of starry nights, binoculars can be your best friend.

How much moon do we see?

One side of the moon always faces Earth. Even so, over time, it’s possible to see as much as 59% of the moon’s surface, due to lunar libration.

Fav photos: 2017’s smallest full moon

EarthSky friends outdid themselves this weekend, taking photos of the full moon. Thanks to all who contributed!

What is virga?

We’ve all seen virga, but maybe not known what it’s called. Virga is rain that evaporates before it hits the ground. Enjoy these photos!

Bright planet over woods

This weekend a great time to see Venus

Venus will be 46 degrees west of the sun on Saturday morning, June 3, 2017. That’s about as far from the sun on our sky’s dome as it can be.

Young moon returns to the west

This very special young moon marks the start of the Muslim holy month of Ramadan. Very tough to spot on May 26 from locations east of the Atlantic, but the Americas had a better shot at it.

Top 10 new species 2017

This year’s list includes a spider and an ant with names drawn from popular books, a pink katydid and an omnivorous rat.

Virgo? Here’s your constellation

The constellation Virgo the Maiden fully returns to the early evening sky – with her feet planted on the eastern horizon – in early May.

The last of Hubble’s Frontier Fields

With a final observation of remote galaxy cluster Abell 370, the Hubble Space Telescope’s mind-stretching Frontier Fields program came to an end.

Why do we celebrate May Day?

Happy May Day! A few words about this annual celebration, which has its roots in astronomy.

Asteroid 2014 JO25 bigger than expected

It’s coming closer today than any asteroid this large since 2004. It came into view of small telescopes a few hours ago. Early radar observations indicate it’s bigger than we thought.

First-ever image of dark matter?

The scientists say their image, which combines images from more than 23,000 galaxy pairs, confirms dark matter’s existence. Will other astronomers agree?

Lenticular clouds look like UFOs

Glorious photos of rare lenticular clouds, sometimes called UFO clouds, plus a word about how they form.

Venus as a crescent world

Photos from the EarthSky community of the planet Venus – next planet inward from Earth in orbit around the sun – in early 2017, in a crescent phase.

Cloud shadow on nearby clouds

Like all objects illuminated by sunlight, clouds cast a shadow.

Last full moon of season this weekend

March 2017 full moon is the 3rd of 3 full moons between the December solstice and March equinox. Harbinger of spring for Northern Hemisphere. Southern Hemisphere’s Harvest Moon.

What moves Death Valley’s sliding stones?

People used to think that strong winds caused the rocks to move across Death Vally’s Racetrack Playa. Turns out, it’s not.

Sliding stone, Death Valley

Here’s a beautiful image of a sliding (or sailing or slithering) stone at Death Valley’s famous Racetrack Playa. Cat Connor caught it on Christmas Day 2014.

Leo and Chinese guardian lions

An earthly lion guards the gates, while, in the sky, a celestial Lion – Leo – ascends. Astrophotographer Jeff Dai of China tells the story.

Why pandas are black and white

The giant panda’s distinct black-and-white markings have two functions: camouflage and communication, says a new study.

March 4 moon hides Aldebaran

The occultation by the moon of Aldebaran – brightest star in Taurus the Bull – was visible from North America. Great set of photos here from the EarthSky community!

Cancer? Here’s your constellation

Here’s how to find the constellation Cancer in your sky. Plus Cancer’s place in sky history, lore and science.

Storm chasers honor Bill Paxton

An amazing several-state tribute – stretching across Tornado Alley – honoring Twister star Bill Paxton, who died Sunday due to complications from heart surgery.

See it! Young moon, Venus, Mars

The moon has returned to the evening sky. This week, it’s sweeping past brilliant Venus and fainter Mars. Photos from the EarthSky community, here.

$40 billion a day for solar super-storms

The probability of another event like the 1859 Carrington event is – at any given time – low. But many believe it’s “almost inevitable” one will occur, eventually. A new study explores the risks.

Leap second to be added December 31

Delay those New Year’s plans. World timekeepers will add a leap second just before midnight on December 31, 2016.

Drought still grips southern California

California has dry spells, but the state hasn’t had exceptional drought since at least 2000. Now, about 20 percent of California is in exceptional drought, and many trees have died.