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Explanation: It is not every day that such an interesting cloud photobombs your image. The original plan was to photograph a rare angular conjunction of Mars and Venus that occurred a week and a half ago, with the added bonus of a crescent Moon and the International Space Station (ISS) both passing nearby. Unfortunately, on Madeira Island, Portugal, this event was clouded out. During the next day, however, a spectacular lenticular cloud appeared before sunset, so the industrious astrophotographer quickly formulated a new plan. A close look at the resulting image reveals the Moon visible toward the left of the...

Explanation: Almost every object in the above photograph is a galaxy. The Coma Cluster of Galaxies pictured above is one of the densest clusters known - it contains thousands of galaxies. Each of these galaxies houses billions of stars - just as our own Milky Way Galaxy does. Although nearby when compared to most other clusters, light from the Coma Cluster still takes hundreds of millions of years to reach us. In fact, the Coma Cluster is so big it takes light millions of years just to go from one side to the other! The above mosaic of images of...

In August 2014 a hobby archaeologist found a Viking Age sword with metal detector in a field in Skaun, just south of Trondheim in Central Norway. Now, archaeologists have examined the finding and have some exciting news about the owner. Having examined the grave, archaeologists at the NTNU Museum of Natural History and Archaeology in Trondheim tell NRK that it is dated to about the year 950. In addition to the sword, researchers found the remains of a shield. 'We have not managed to find out who owned the sword, but we know that he was a well traveled man",...

...The newly discovered monumental room is believed to be an extension of the underground Temple of Sidon, which dates back to the Bronze Age. This finding comes as workers prepare the foundations of a new national museum, which will be established beside the archaeological site. Construction of the museum led to urgent excavations at the site last month. Ten years ago, the delegation discovered an underground "holy of holies" room, dating back to 1300 B.C., where ancient residents are believed to have worshipped their gods. The newly discovered room was found adjacent to it, and is thought to be an...

Explanation: Taken on February 20, five different exposures made in rapid succession were used to created this tantalizing telephoto image. In combination, they reveal a wide range of brightness visible to the eye on that frigid evening, from the urban glow of the Quebec City skyline to the triple conjunction of Moon, Venus and Mars. Shortly after sunset the young Moon shows off its bright crescent next to brilliant Venus. Fainter Mars is near the top of the frame. Though details in the Moon's sunlit crescent are washed out, features on the dark, shadowed part of the lunar disk are...

Explanation: Buffeted by the solar wind, Comet Lovejoy's crooked ion tail stretches over 3 degrees across this telescopic field of view, recorded on February 20. The starry background includes awesome bluish star Phi Persei below, and pretty planetary nebula M76 just above Lovejoy's long tail. Also known as the Little Dumbbell Nebula, after its brighter cousin M27 the Dumbbell Nebula, M76 is only a Full Moon's width away from the comet's greenish coma. Still shining in northern hemisphere skies, this Comet Lovejoy (C/2014 Q2) is outbound from the inner solar system some 10 light-minutes or 190 million kilometers from Earth....

Explanation: Venus, named for the Roman goddess of love, and Mars, the war god's namesake, came together by moonlight in this lovely skyview, recorded on February 20 from Charleston, South Carolina, USA, planet Earth. Made in twilight with a digital camera, the three second time exposure also records earthshine illuminating the otherwise dark surface of the young crescent Moon. Of course, the Moon has moved on from this much anticipated triple conjunction. Venus still shines in the west though as the evening star, third brightest object in Earth's sky, after the Sun and the Moon itself. Seen here within almost...

Explanation: The Rosette Nebula is not the only cosmic cloud of gas and dust to evoke the imagery of flowers -- but it is the most famous. At the edge of a large molecular cloud in Monoceros, some 5,000 light years away, the petals of this rose are actually a stellar nursery whose lovely, symmetric shape is sculpted by the winds and radiation from its central cluster of hot young stars. The stars in the energetic cluster, cataloged as NGC 2244, are only a few million years old, while the central cavity in the Rosette Nebula, cataloged as NGC 2237,...

Explanation: What is creating unusual plumes on Mars? No one is sure. Noted and confirmed by a global contingent of amateur astronomers on photos of the red planet in March 2012, possibly similar plumes have now been found on archived images as far back as 1997. Since the plumes reach 200 kilometers up, they seem too high to be related to wind-blown surface dust. Since one plume lasted for eleven days, it seemed too long lasting to be related to aurora. Amateur astronomers will surely continue to monitor the terminator and edge regions of Mars for new high plumes, and...

Parton and colleagues writing in Geology, present a unique alluvial fan aggradation record from southeast Arabia spanning the past approx. 160,000 years. Situated along the proposed southern dispersal route, the Al Sibetah alluvial fan sequence provides a unique and sensitive record of landscape change in southeast Arabia. This record is to date the most comprehensive terrestrial archive from the Arabian Peninsula, and provides evidence for multiple humid episodes during both glacial and interglacial periods. Evidence from the Al Sibetah alluvial fan sequence indicates that during insolation maxima, increased monsoon rainfall led to the widespread activation of drainage systems and grassland...

Hard water contains less Carbon-14 than the atmosphere, because dissolved carbonates are Carbon-14 free. A fish caught in hard water has thus a higher Carbon-14 age than contemporaneous terrestrial samples. If such a fish is then cooked in a ceramic pot, the radiocarbon age of the food crust will be higher than if a terrestrial animal was cooked in the pot. This is known as the “reservoir effect” because the fish’s carbon actually comes from another “reservoir” than the carbon in terrestrial animals from the surrounding area. “Reservoir age” is the difference between the true age and the Carbon-14 date......

A team of archaeologists at a 2,000-year-old limestone quarry in Lebanon’s Bekka Valley recently excavated around a megalith weighing approximately 1,000 tons and dubbed Hajjar al-Hibla, or “stone of the pregnant woman.” It was intended for the Temple of Jupiter, which sits on three limestone blocks of similar size at the nearby site of Baalbek. To the team’s shock, they unearthed yet another block, this one weighing an estimated 1,650 tons, making it the largest known megalith. The German Archaeological Institute’s Margarete van Esse says excavation was suspended when the trench became dangerously deep. “Hopefully in a following campaign we...

Perhaps even more intriguing is a single shell with what appears to be a geometric pattern—zigzagged grooves carved into the center of the outer shell. Analysis points to the patterns being carved on purpose. Again the team turned to modern mussels; they tried carving similar patterns into Potamida littoralis with a shark tooth and compared that to weathering and natural abrasions. Sure enough, their carvings were the closest matches to the ancient pattern. “That must have been an appealing thing for Homo erectus,” says Joordens. “You can imagine sitting there with a shell in one hand and a tool in...

Explanation: Which is older -- the rocks you see on the ground or the light you see from the sky? Usually it's the rocks that are older, with their origin sentiments deposited well before light left any of the stars or nebulas you see in the sky. However, if you can see, through a telescope, a distant galaxy far across the universe -- further than Andromeda or spiral galaxy NGC 7331 (inset) -- then you are seeing light even more ancient. Featured here, the central disk of our Milky Way Galaxy arches over Toadstool hoodoos rock formations in northern Arizona,...

The Norwegian archaeologists Helge and Anne Stine Ingstad's famous identification, in 1961, of a Viking settlement at L'Anse aux Meadows, Newfoundland, from just after A.D. 1000 is, of course, a notable exception, no longer in dispute. But that discovery has so far gone nowhere. The Norse settlers, who may have numbered as many as 160 and stayed for three years or longer, seem to have made no lasting impression on the aboriginal skraellings that, according to Norse sagas, they encountered, and to have avoided being influenced in turn. The traditions of the Micmac people, modern-day inhabitants of the area, have...

Explanation: Connecting the Pipe Nebula to the colorful region near bright star Antares is a dark cloud dubbed the Dark River, flowing from the picture's left edge. Murky looking, the Dark River's appearance is caused by dust obscuring background starlight, although the dark nebula contains mostly hydrogen and molecular gas. Surrounded by dust, Antares, a red supergiant star, creates an unusual bright yellowish reflection nebula. Above it, bright blue double star Rho Ophiuchi is embedded in one of the more typical bluish reflection nebulae, while red emission nebulae are also scattered around the region. Globular star cluster M4 is just...

In 2010, scientists made a startling discovery about our past: About 50,000 years ago, Neanderthals interbred with the ancestors of living Europeans and Asians. Now two teams of researchers have come to another intriguing conclusion: Neanderthals interbred with the ancestors of Asians at a second point in history, giving them an extra infusion of Neanderthal DNA. The findings are further evidence that our genomes contain secrets about our evolution that we might have missed by looking at fossils alone. "We're learning new, big-picture things from the genetic data, rather than just filling in details," said Kirk E. Lohmueller, a geneticist...

Actor Samuel L. Jackson, who worked as a camera stand-in for Bill Cosby for three years in the 1980s, is the latest celebrity to weigh-in on the sexual assault scandal that continues to engulf the comedian. The Pulp Fiction star said on Bravo’s Watch What Happens Live on Thursday: 'I wish he would say something.' 'Popular opinion would say, ''Where there’s smoke, there’s fire'',' Jackson said, according to philly.com. 'But, I mean, I can’t make a judgment about it. 'I mean, I make my judgments because I have a daughter, I have a wife that I love. 'I have a...

Explanation: From January 11 to February 25 2013, a pinhole camera sat in a field near Budapest, Hungary, planet Earth to create this intriguing solargraph. And for 45 days, an old Antonov An-2 biplane stood still while the Sun rose and set. The camera's continuous exposure began about 20 days after the northern hemispere's winter solstice, so each day the Sun's trail arcs steadily higher through the sky. These days in the Sun were recorded on a piece of black and white photosensitive paper tucked in to the simple plastic film container. The long exposure produced a visible color image...

Explanation: Eight years ago, an evening sky held this lovely pairing of a young crescent Moon and brilliant Venus. Seen near the western horizon, the close conjunction and its wintry reflection were captured from Bolu, Turkey, planet Earth on February 19, 2007. In the 8 Earth years since this photograph was taken Venus has orbited the Sun almost exactly 13 times, so the Sun and Venus have now returned to the same the configuration in Earth's sky. And since every 8 years the Moon also nearly repeats its phases for a given time of year, a very similar crescent Moon-Venus...