The constellation Virgo the Maiden fully returns to the early evening sky – with her feet planted on the eastern horizon – by early May.
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While preparing on Sunday to watch today’s transit – an event Mercury crosses the face of our sun – Helio C. Vital caught an airplane doing the same.
“Since three years ago, we have planned to shoot this photo. We went to the zone repeatedly but every time we got nothing … until now.” – Sergio Vindas
The meltdown at the Chernobyl Nuclear Power Plant on April 26, 1986 exposed 572 million people to radiation. It was far worse than the 2011 Fukushima accident.
As Earth spins under the sky, the stars appear to move. When a camera captures that movement, that’s called a star trail. Plus … an astrophotographer explains how he does it.
Many hoped Comet 252P/LINEAR would become visible to the eye. It has, but only barely. Enjoy photos from the few, the proud, who’ve captured this comet on film!
April 7 moon turns new six hours before perigee – closest point to Earth. We won’t see it, but it counts as a supermoon and will affect ocean tides.
Scientists have discovered a tiny 430-million-year-old sea creature – dubbed Kite Runner – that apparently dragged its offspring around on strings like kites.
Record-breakingly close flybys of two comets earlier this week. Radar images of one, the closest comet in 246 years. Will the other be visible to the eye?
We’ll have six supermoons in 2016. The first one is a new moon supermoon, not visible in our sky.
These lens-shaped clouds are often mistaken for UFOs. Here’s how they form, plus gorgeous photos.
As the list of known planets beyond our solar system grows, the search for their moons is intensifying. Why exomoons might be key to E.T. life.
First time we can see 5 planets at once since 2005. All 5 are up before dawn, still, and all 5 will remain visible until Mercury disappears in the dawn just after mid-February.
Best photos from the EarthSky community of the 5 bright planets now visible at once in the sky before dawn. Thanks to all who posted!
Claims about new planets that turned out to be wrong – and why ‘Planet Nine’ may be different.
“What we have seen this past year will likely be routine in about 15 years, although regionally the details will vary considerably,” says climate expert Kevin Trenberth.
Comet C/2013 US10 (Catalina) has been a wonderful target for photographers. See photos of this icy visitor from the depths of space, here. Thanks to all who submitted!
Moon passes in front of, or occults, bright star Aldebaran tonight as seen from N. America, and parts of Europe and Africa. Plus … Aldebaran as part of a double pole star.
A million thanks to you who posted photos on EarthSky pages of Venus and Saturn Saturday morning! Closer than any two planets since 2013 …
Are supermoons hype? In our opinion … no, just modern folklore. And they cause real physical effects, such as larger-than-usual tides.
Click here for a video visualization of events leading to one of the iconic photographs of the 20th century – Earth rising over the moon – as seen by Apollo 8 astronauts.
Most work on time travel has focused on its theoretical aspects, but there are also attempts to simulate the effects of time travel experimentally.
Over the past 14,000 years, penguin numbers in East Antarctica increased 135-fold because of disappearing glaciers and sea ice. How long can populations keep growing?
With COP21 poised to begin in Paris, a new UN report suggests that weather-related disasters were nearly twice as frequent over the past decade as two decades ago.
Hole-punch clouds are sometimes called fallstreak holes. They are often-circular patches of clear sky, surrounded by clouds. Airplanes create them.
The mysterious grooves on Phobos are likely early signs of structural failure. Scientists expect the moon to be pulled apart in 30 to 50 million years.
It might look like a UFO – but it’s really a hole-punch cloud. A word about the classic connection between hole-punch clouds, jets and snowfall.
People in Los Angeles and various states in the U.S. West saw the mysterious light. It was confirmed as a Naval missile test off the California coast.
Last week heralded as largest known asteroid to pass Earth until 2027. Swept within 1.3 times the moon’s distance on October 31. Now thought to be a comet!
If you’re a beginning stargazer or a veteran of thousands of starlit nights, binoculars can be your best friend. Here’s how to get started.
It’s the largest astronomical image of all time, used by astronomers in the search for distant exoplanets and multiple star systems.
If you could see the shock wave from a jet moving faster than sound, this is what it would look like.
October has two birthstones – opal and tourmaline.
The constellation Capricornus the Sea-goat. How to see it, and how a sea-goat came to reside among the stars.
61 Cygni isn’t bright. But it moves exceptionally rapidly against the background of more distant stars. Its motion reveals its nearness to Earth.
You can see the constellation Sagittarius on August evenings. Look here for the lore and science of this constellation.
Many features on Charon informally named from science fiction, particularly Star Trek and Star Wars. Lord of the Rings, Stanley Kubrick also honored.
Scientific arguments suggest that alien civilizations should be common in our galaxy. If so, where is everybody? That question is known as the Fermi paradox.
The most accurate analog ever found for our sun and and its largest planet, Jupiter. Could there be another Earth in this system, too?
On summer nights, two famous stars shine down from high in the northern sky. Eltanin and Rastaban represent the fiery Eyes of the constellation Draco the Dragon.
The newly found galaxy, labelled CR7, is three times brighter than the brightest distant galaxy known up to now. It may contain some of the first stars.
Bill made landfall late Tuesday morning as a tropical storm. Now weakened, it will produce heavy rain in parts of the south-central U.S. on Wednesday.
These sorts of clouds typically form where stable moist air flows over a mountain or a range of mountains.
Auroras stem from activity on the sun and so are seen when the sun has been active. Noctilucent clouds are seasonal, seen in late May through August each year.
People at high latitudes are seeing glowing clouds in a dark night sky. They’re called noctilucent or “night-shining” clouds.
Photos from EarthSky community of the young moon, and bright planets Venus and Jupiter on these May evenings, 2015. Watch for them in the west!
What does this year’s odd U.S. weather have in common with a huge spike in hungry, stranded sea lion pups on California shores? Both are linked to a giant patch of warm ocean water.
From California’s Death Valley to China’s Flaming Mountains of Xinjiang … the world’s hottest places. And coldest places! New infographic by GB Energy Supply.
“Sometimes you know you are in the right place at the right time. That you are doing what you are meant to be doing. That it all comes together and your heart sings.”
Happy May Day! A few words about this annual celebration, whose roots are in astronomy.
Why do different institutions – NASA, NOAA, and the Japanese Meteorological Agency – publish slightly different global temperature measurements?
No matter what the weather where you are, enjoy these photos from EarthSky friends on Facebook and G+.
The brightness of this unusual nova has gone up and down and now back up again. EarthSky friend Tom Wildoner tells you how to see the nova before it’s gone!
The first supermoon of 2015 comes on January 20. It’s not a full moon. It’s a new supermoon, between the Earth and sun. So you won’t see it, but those along coasts might experience higher-than-usual tides in the coming day or two.
Spacecraft is headed to L-1 point in Earth-sun system, where it’ll provide advance warning of incoming solar storms that can disrupt power grids and satellite systems.
Astronomers tinkering with ice and organics in the lab might have discovered why icy comets have hard, outer crusts.
Cool air on the sea surface strongly refracted the setting sun, seen Saturday night from a small town near Rio de Janeiro, Brazil. Cool series of images!
Unstable carbon-14 gradually decays to carbon-12 at a steady rate. The ratio of these carbon isotopes reveals the ages of some of Earth’s oldest inhabitants.
Those who admire the shape of a Christmas tree might like to know that its shape has evolved in response to wind, snow, and light.
With a small ‘scope or large binoculars, you can catch Comet Finlay. It’ll be near Mars on December 23 and 24. Cool photo opportunity for those equipped to catch it!
As winter comes to the far north, sky conditions may be just right to produce a beautiful light phenomenon called “light pillars.”
The dayside images of Rosetta’s comet have been fantastic. Now, thanks to backscatter of sunlight from the comet’s coma, we’re seeing amazing nightside images.
Astronomers have observed signals from a highly magnetized neutron star, indicating starquakes that set the neutron star ringing like a bell.
As Voyager 1 left Earth on September 18, 1977, it looked back and acquired a stunning image.
National Radio Astronomy Observatory astronomers used a tried-and-true method – stellar parallax – to resolve a controversy over the Pleiades’ distance.
On the anniversary of Voyager 2’s encounter with Neptune and Triton … an awesome collection of restored Voyager 2 images, plus the link between Triton and Pluto.
It was a glorious weekend for planet-watching. The moon waned and appeared lower in the east before dawn each day, sweeping past Venus and Jupiter.
It’s been a banner year for iceberg sighting in Iceberg Alley, the area off northeastern Newfoundland where the Titanic struck an iceberg and went down in April, 1912.
Twilight is the time of day between daylight and darkness. Astronomers, the experts on nighttime, recognize three kinds of twilight.
A farmer captured this photo of a serious storm sweeping through northern Illinois on Monday, June 30.
We see only 50% of the moon’s surface at one time. Even so, over time, lunar libration lets careful observers peek at a tiny portion of the moon’s far side.
For a few hours around midnight, in Kansas, temperatures suddenly shot up by 10 degrees F. Meteorologists call it a heat burst. Read how it happens.
A volcano erupting under an immense glacier would have created large lakes of liquid water on Mars in the relatively recent past. And where there’s water, there’s the possibility of life.
North America is predicted to have the best view of a possible new meteor shower from Comet 209P/LINEAR Friday night through Saturday morning (May 23-24, 2014). The Camelopardalids, coming up!
Chance for significant severe weather is possible across the Plains on Mother’s Day. Strong tornadoes and large hail possible.
After a slow start to severe weather season in 2014, Sunday brought storms to the U.S. Central Plains. Monday through Wednesday, the system will move into the U.S. Southeast.
A mythical Celtic god of the sea and the edgewise view into our own Milky Way galaxy, as captured by Glenn Miles Photography in Northern Ireland.
Before and after satellite images of the March 22 landslide near Oso, Washington
Looking for the constellation Cancer? How to find it here. Plus Cancer’s place in sky history, lore and science.
Just when scientists thought that all butterfly species in the eastern U.S. were identified, researchers stumbled across not one, but two new species, right under their noses.
For astronomers, a binary or double star is a gift from the heavens. Astronomers observe these stars to find telltale clues to each star’s mass.
It’s like a hurricane, but it’s over land. These systems are not uncommon in Australia, and, last weekend, conditions were ripe for one.
2014 unleashed its first X-flare of 2014 on January 7. Space weather experts are calling for a good display of auroras.
Normally these remote galaxies would be too faint to see, even with the Hubble Space Telescope. Astronomers used a bizarre trick of nature to photograph them.
The solstice is behind us. At high northern latitudes, sunlight is returning only briefly each day or casts an eerie twilight glow.
The work could provide insights into the workings of black-hole jets and help us understand the rate of the expansion of the universe.
This new moon at the New Year is also one of the closest moons of the year. The close, new moon will cause tides to be higher than usual.
The amount of U.S. land burned by wildfires during 2013 was 41% lower than the 10-year average, according to preliminary estimates.
Venus is beautiful now! Just don’t wait too many days to look for it. It’ll soon disappear in the glare of sunset.
A new study shows that the risk of injury from tornados and severe storms can be reduced significantly with the use of certain media.
If you photographed the sun at the same time each day – subtracting an hour as needed for Daylight Saving Time – the resulting figure-8 would be an analemma.
“We might witness a nice, long-tailed comet visible to the naked eye that will leave millions of people with fond memories for a lifetime, or maybe it will be a small comet for sky hunters using binoculars and a good map of its position. Or it might yet break up and vanish.” – Alan MacRobert
Death toll is rising as reports trickle in from storm-damaged areas. Video and images here of Super Typhoon Haiyan.
Scientists have pinpointed the brain region responsible for “illusory contours”—when you perceive imaginary shapes and surfaces against a fragmented background.
September 2013 has been busy for sightings of bright fireballs. The one at 11:33 p.m. local time on September 27 was the 14th fireball sighting in the U.S. in September.
The world’s thinnest glass is just a molecule thick, a serendipitous discovery by scientists, recorded for posterity in the Guinness Book of World Records.
American astronomer Asaph Hall discovered Phobos, one of the two Martian moons, on this date in 1877. Did he imagine how well we’d see Mars’ moons today?
So far, scientists have seen a fractured, ice-covered world with tantalizing signs of a liquid water ocean – a possible home for microbial life – under its surface.
A surge of fire activity in northern Siberia, caused in part by high temperatures.
Astronomers are observing the “noodle effect” as the black hole’s powerful gravity stretches and elongates the cloud.
You may be shocked to learn that drinking large quantities of your favorite carbonated soda could be as damaging to your teeth as methamphetamine and crack cocaine use.
Iridescent clouds – clouds with rainbow colors – happen when especially tiny water droplets or small ice crystals individually scatter light.
Scientists from Nanyang Technological University (NTU) and Lund University, Sweden, have bioengineered a novel molecule which has been proven to successfully kill tumor cells.
Temperatures have been well below average for the Southeast United States for the first half of May 2013. Here’s why.
University of Georgia researchers used a Facebook page to determine the trajectories of tornado debris.
New research aimed at developing ultrasonic microphones with insect-like sensitivity will continue in the rainforests of Colombia and Ecuador.
On February 20, 2013, Death Valley National Park earned designation as an International Dark Sky Park for its pristine views of the starry nighttime sky.
At 62, the Laysan albatross Wisdom is one of the oldest wild birds known to be living in the world today. Yes, her new chick is adorable.
Amazing pictures and video from Hattiesburg, Mississippi as a large tornado strikes the city on February 10, 2013.
Researchers studying corn seeds have found evidence that full “siblings” preferentially feed each other. They describe this behavior as altruism among corn.
Hearty microorganisms float in the harsh air of hailstorms and hurricanes.
Astronomers have used a new method to determine the mass of the planetary nursery around the star TW Hydrae.At a distance of merely 176 light-years from Earth, this is the closest star that is currently forming new planets.
A new study used computer modelling to shed light on the origin of sight in animals, including humans.
Orbiting satellite acquired view of an aurora, seen from above, on October 8, 2012. These northern lights resulted from a storm on the sun several days earlier.
“Where’s the hottest place on Earth” is a contentious issue. Some contenders: Iran’s Lut Desert, China’s Turpan Basin and the badlands in Queensland, Australia.
As of now, it appears that Isaac caused the deaths of nearly 40 people and will result in at least $3 billion in damages.
July 2012 was the fourth straight month in which the Northern Hemisphere set a new monthly land temperature record. It was the fourth-warmest July globally.
Giant sunspot group 1520 – which spans about 10 Earth diameters on the sun’s surface – emitted an X-flare on July 12 at 1653 UTC.
In 2007, we saw the smallest Arctic summertime ice extent since record keeping began. As summer 2012 begins, ice is melting faster now than at this same time in 2007.
Joplin tornado of May 22, 2011 was deadliest single U.S. tornado since 1950 and costliest tornado in world history. See videos. Learn how Joplin is rebuilding.
Good news for penguin lovers! New satellite images show that there are twice as many emperor penguins in Antarctica than previously thought.
At least 11 confirmed tornadoes struck the Dallas-Fort Worth area on April 3, causing damage but no deaths. Here’s what’s known now, plus the best videos.
A 6.7 magnitude earthquake rocked the Philippines on February 6, 2012 killing at least 15 people, with many still missing.
If extra-terrestials visited the moon, they may have left tell-tale signs. It’s worth a look, says a leading scientist, and won’t cost much.
Favorite pics of sunrises and sunsets – with an explanation of why they’re so beautiful! Post your sunrise and sunset images on EarthSky’s Facebook page.
While in space, 12 generations of worms were found to reproduce and develop from egg to adulthood no differently than they would on Earth.
Our brain cells munch on themselves, to keep the body from starving. A new study sheds light on the role this plays in regulating appetite.
Featured this week, lifelike robots – plus lakes on Jupiter’s moon and an eclipse of the midnight sun. Song of the week from Ocote Soul Sound.
Earth might have been spared from a collision with Mars or Venus by the process in which a fifth giant world was ejected from our solar system.
A haboob – an enormous dust storm – swept through parts of Lubbock, Texas on the evening of Monday, October 17, 2011.
Coastal fish farms seem to do less harm to nearby plants and animals than previously believed, a new study reveals.
The largest of the Texas fires – the Bastrop fire near Austin in Central Texas – is said to be 30 percent contained today.
UPDATE: Sunday, August 28, 5:40 p.m. EDT (21:40 UTC). Tropical Storm Irene has been gradually weakening and is beginning to lose tropical characteristics.
The huge stock of carbon contained in tundra could increase atmospheric CO2 drastically, when released by a fire.
Watch a video that shows tropical storm Arlene as it forms in the Gulf of Mexico on June 27, 2011.
A ten-year study shows that loggerhead turtles go back to the same spots year after year.
Astronomers captured light from 40,000 galaxies and discovered that even in the early universe, galaxies were either awake or asleep.
Growing scarcity of girls and women has tilted the balance of the sexes and the rich and poor in nations where “gendercide” is practiced on a large scale.
The mind is a great statistician, say psychologists studying two types of perception.
This Facebook map of the world shows the connections between about 10 million friends.
November meteor showers, a frozen zoo, butterfly medicine, a Bill of Rights for aliens – plus some great music – all this week on EarthSky 22.