Astronomy Magazine

Stonehenge, the infamous stone circle on Salisbury Plain, U.K., dates to around 2500 B.C.E. The monument is aligned so that if you are standing at the center of the ring on the summer soltice (which can be June 20, 21, or 22), the Sun rises over the Heel Stone; solstice celebrations are believed to have Continue reading "June 21, ca. 2500 BCE: Summering at Stonehenge" The post June 21, ca. 2500 B…

Looking for a sky event this week? Check out our full Sky This Week column.  June 20: Libra’s Ghost Cluster The summer solstice occurs at 4:25 A.M. EDT. This is the time the Sun reaches its northernmost point in the Northern Hemisphere sky, which also means our star takes its longest path across this hemisphere’s sky on Continue reading "The Sky Today on Sunday, June 21: A summertime lineup" The …

On June 20, 1943, Pingualuit Crater (formerly known as Chubb Crater and as the New Quebec Crater) was first photographed by a U.S. Army Air Force crew during a meterological flight over northern Quebec. Formed approximately 1.4 million years ago by a meteorite impact, the 2.1-mile-wide (3.4 kilometers) crater has an unusually circular shape resulting Continue reading "June 20, 1955: Pingualuit Cr…

Looking for a sky event this week? Check out our full Sky This Week column.  June 19: Dione crosses due north of Saturn Highest in the south around 10:30 P.M. local daylight time is the constellation Libra, whose brightest star is Beta (β) Librae, also called Zubeneschamali. Nearly 12° below (south) of this star at that time Continue reading "The Sky Today on Saturday, June 20: Libra’s Ghost Clus…

On June 19, 2004, at the Kitt Peak National Observatory in Tucson, Arizona, astronomers Roy Tucker, David Tholen, and Fabrizio Bernardi discovered Asteroid Apophis. This Near-Earth Object (NEO), approximately 1,099 to 1,230 feet (335 to 375 meters) wide, reached the highest ever rating of level 4 out of 10 on the Torino Impact Hazard Scale, Continue reading "June 19, 2004: Astroid Apophis is disc…

Looking for a sky event this week? Check out our full Sky This Week column.  June 18: The Moon and the Sickle Saturn rules the early-morning sky, shining at 1st magnitude in otherwise dim Pisces the Fish. One of the ringed planet’s many moons, Dione, passes due north of Saturn the morning of June 19. The 10th-magnitude Continue reading "The Sky Today on Friday, June 19: Dione crosses due north of…

Friday, June 19The Moon passes 0.3°  south of Regulus at 11 A.M. EDT. By evening, our satellite has moved farther east to lie to the bright star’s upper left as they slowly set in the west after sunset.  Bright Venus is now located in central Cancer and is just 45’ north of M44, the Beehive Continue reading "The Sky This Week from June June 19 to 26: The summer solstice" The post The Sky This Wee…

We’re used to a lot of different natural things falling out of the sky. These can include snow, rain, and sometimes even frogs (yes, really). All of these relate to weather phenomena. Far more exotic things fall from the sky that are not related to weather. Earth is pelted by about 14 tons of micrometeorites Continue reading "A meteorite impact may have once rained gold on Western Australia – new…

Sally Ride made history aboard the Space Shuttle Challenger on June 18, 1983, becoming the first American woman in space 20 years nearly to the day after Soviet Valentina Tereshkova’s flight. In 1977, as she was finishing her Ph.D. in physics, Ride saw a newspaper ad placed by NASA to recruit astronauts. For the first Continue reading "June 18, 1983: Sally Ride is the first American woman in spac…

John Vermette, taken from Starfront Observatory, Texas The famous galaxy group Markarian’s Chain in the heart of the Virgo cluster of galaxies dominates this wide-field vista as a line of eight galaxies stretching from upper left. But there are many more galaxies in this image: Every dot of light is a galaxy, as the photographer Continue reading "Virgo vertigo" The post Virgo vertigo appeared fir…

Looking for a sky event this week? Check out our full Sky This Week column.  June 17: The Moon covers Venus Now it’s Venus’ turn to close in on the Beehive Cluster (M44), which sparkles in central Cancer. Tonight after sunset, blazing Venus is just 1.3° from the center of this loose open cluster, which is visible Continue reading "The Sky Today on Thursday, June 18: The Moon and the Sickle" The p…

The wait is almost over. The Vera C. Rubin Observatory is just weeks, maybe even just days, away from officially beginning its landmark 10-year sky survey, according to officials at the 248th American Astronomical Society (AAS) meeting in Pasadena this week. “A lot of people in the community are waiting for that moment for the Continue reading "Vera C. Rubin Observatory days away from launching d…

On June 17, in the year 2 B.C.E, a significant planetary conjunction occurred involving Venus and Jupiter. From Earth’s perspective, these two bright planets appeared to draw so close that they would have seemed to merge into nearly a single, brilliant object in the sky. This type of celestial alignment occurs because planets move in Continue reading "June 17, 2 BCE: A conjunction between Venus a…

Looking for a sky event this week? Check out our full Sky This Week column.  June 16: The Moon meets up with Mercury and Jupiter The Moon, moving east along the ecliptic (the plane of the solar system and the line along which the planets and Moon move on the sky), passes 3° north of Jupiter in Continue reading "The Sky Today on Wednesday, June 17: The Moon covers Venus" The post The Sky Today on …

Massimo Di Fusco, taken via Chilescope NGC 6727 is a reflection nebula and star-forming region in Corona Australis, part of the larger Corona Australis Molecular Cloud. It is accompanied in this image bygGlobular cluster NGC 6723, sometimes called the Chandelier Cluster. This wide-field portrait combines 54 minutes of RGB exposure with a 20-inch f/3.8 scope. The post A glob and a stellar nursery …

On June 16, 1963, 26-year-old Soviet cosmonaut Valentina Tereshkova made history by becoming the first woman to travel into space. A former factory seamstress, Tereshkova was an accomplished amateur parachutist with over 100 jumps — a vital skill, since Vostok cosmonauts ejected before landing. Selected from over 400 applicants in 1962, she underwent months of Continue reading "June 16, 1963: Val…

Looking for a sky event this week? Check out our full Sky This Week column.  June 15: Mercury at greatest eastern elongation The Moon passes 3° north of Mercury at 4 P.M. EDT. Looking west again after sunset this evening, the Moon now sits above Mercury, forming a triangle with Mercury and Jupiter.  Half an hour after Continue reading "The Sky Today on Tuesday, June 16: The Moon meets up with Mer…

Astronomers have created a comprehensive census of active galactic nuclei (AGN) — galaxies powered by a feeding central black hole. The new census, led by data pipeline developer Mugdha Polimera at the Center for Astrophysics | Harvard & Smithsonian, began while she was a graduate student at the University of North Carolina at Chapel Hill, Continue reading "Active black holes are more common than…

On June 15, 763 B.C.E., a near-total solar eclipse occurred over northern Assyria and was recorded by observers in Nineveh, the capital city. This event is preserved in the Eponym Canon, a list of historical events made by the Assyrians on clay tablets, following a specialized calendar system. The text notes: “Insurrection in the City Continue reading "June 15, 763 BCE: Assyrians record a solar e…

Gaetan Thibault from Sainte-Catherine-de-la-Jacques-Cartier, Quebec, Canada A meteor slices across the Summer Triangle — glowing hot blue as it reaches peak brightness in the center of its trail. This wide-field view combines 21 minutes of total exposure taken with a Canon astrophography DSLR and 20mm lens at f/3.2 (one meteor frame and 20 additional 60-second Continue reading "A June Epsilon Cyg…