Astronomy Picture of the Day: October 27th of 2017

Mirach's Ghost
Image Credit & Copyright: Kent Wood Explanation: As far as ghosts go, Mirach's Ghost isn't really that scary. Mirach's Ghost is just a faint, fuzzy galaxy, well known to astronomers, that happens to be seen nearly along the line-of-sight to Mirach, a bright star. Centered in this star field, Mirach is also called Beta Andromedae. About 200 light-years distant, Mirach is a red giant star, cooler than the Sun but much larger and so intrinsically much brighter than our parent star. In most telescopic views, glare and diffraction spikes tend to hide things that lie near Mirach and make the faint, fuzzy galaxy look like a ghostly internal reflection of the almost overwhelming starlight. Still, appearing in this sharp image just above and to the left of Mirach, Mirach's Ghost is cataloged as galaxy NGC 404 and is estimated to be some 10 million light-years away.

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National Geographic Photo of the Day: Ocotber 26th of 2017

October 26, 2017

Family Feast

While photographing in Tanzania's Serengeti National Park, Your Shot photographer Sonalini Khetrapal came across a group of cheetahs feasting on a springbok. "It was fascinating to watch the brothers intermittently embrace each other and lick the blood off each other’s faces while the mother kept guard," she says. "This photograph captures the harshness of the wild and yet softens us to witness the strong bond between the brothers."

Photograph By Sonalini Khetrapal, National Geographic Your Shot

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Astronomy Picture of the Day: Ocotber 26th of 2017

NGC 7635: Bubble in a Cosmic Sea
Image Credit & Copyright: Rolf Geissinger Explanation: Adrift in a cosmic sea of stars and glowing gas the delicate, floating apparition left of center in this widefield view is cataloged as NGC 7635, the Bubble Nebula. A mere 10 light-years wide, the tiny Bubble Nebula was blown by the winds of a massive star. It lies within a larger complex of interstellar gas and dust clouds found about 11,000 light-years distant, straddling the boundary between the parental constellations Cepheus and Cassiopeia. Included in the breathtaking vista is open star cluster M52 (lower left), some 5,000 light-years away. Above and right of the Bubble Nebula is an emission region identified as Sh2-157, also known as the Claw Nebula. Constructed from 47 hours of narrow-band and broad-band exposures, this image spans about 3 degrees on the sky. That corresponds to a width of 500 light-years at the estimated distance of the Bubble Nebula.

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National Geographic Photo of the Day: October 25th of 2017

October 25, 2017

Seeing Double

Your Shot photographer Øyvind Blomstereng says he waited for years to get this photo in his hometown of Trondheim, Norway. "There was a full moon and low pressure outside the coastline of my part of Norway," he explains. "Normally there is a distance from the wharves to the river ... not this morning."

Photograph By Øyvind Blomstereng, National Geographic Your Shot

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Astronomy Picture of the Day: October 25th of 2017

Marius Hills and a Hole in the Moon
Image Credit: NASA, Lunar Orbiter 2; Inset: Lunar Reconnaissance Orbiter Explanation: Could humans live beneath the surface of the Moon? This intriguing possibility was bolstered in 2009 when Japan's Moon-orbiting SELENE spacecraft imaged a curious hole beneath the Marius Hills region on the Moon, possibly a skylight to an underground lava tube. Follow-up observations by NASA's Lunar Reconnaissance Orbiter (LRO) indicated that the Marius Hills Hole (MHH) visually extends down nearly 100 meters and is several hundred meters wide. Most recently, ground penetrating radar data from SELENE has been re-analyzed to reveal a series of intriguing second echoes -- indicators that the extensive lava tubes exist under Marius Hills might extend down even kilometers and be large enough to house cities. Such tubes could shelter a future Moon colony from large temperature swings, micro-meteor impacts, and harmful solar radiation. Potentially, underground lava tubes might even be sealed to contain breathable air. These lava tubes likely formed when lunar volcanos were active billions of years ago. Pictured, the surface of Marius Hills region was captured in the 1960s by NASA's Lunar Orbiter 2 mission, while an inset image of the MHH is shown from NASA's continuing LRO. Several volcanic domes are visible, while Marius Crater is visible on the upper right.

National Geographic Photo of the Day: October 24th of 2017

October 24, 2017

Look Up

While driving through Northern California, Your Shot photographer Josh Heidebrecht experienced a moment of photographic serendipity after he and his friend pulled over to see what they could find in the grove. "While searching, a squirrel briefly chattered above me, causing me to look straight up," he remembers. "Luckily I had my wide-angle lens with me so I could capture this perspective of the partially burnt redwoods towering above us in an eerie silence."

Photograph By Josh Heidebrecht, National Geographic Your Shot

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Astronomy Pictureof the Day: October 24th of 2017

Where Your Elements Came From
Image Credit & License: Wikipedia: Cmglee; Data: Jennifer Johnson (OSU) Explanation: The hydrogen in your body, present in every molecule of water, came from the Big Bang. There are no other appreciable sources of hydrogen in the universe. The carbon in your body was made by nuclear fusion in the interior of stars, as was the oxygen. Much of the iron in your body was made during supernovas of stars that occurred long ago and far away. The gold in your jewelry was likely made from neutron stars during collisions that may have been visible as short-duration gamma-ray bursts or gravitational wave events. Elements like phosphorus and copper are present in our bodies in only small amounts but are essential to the functioning of all known life. The featured periodic table is color coded to indicate humanity's best guess as to the nuclear origin of all known elements. The sites of nuclear creation of some elements, such as copper, are not really well known and are continuing topics of observational and computational research.

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National Geographic Photo of the Day: October 23rd of 2017

October 23, 2017

Mermaid Parade

Since 1983, Coney Island in Brooklyn, New York, has thrown a Mermaid Parade as a celebration of the start of summer. More than 1,500 people dress in elaborate, artistic costumes, traveling through the neighborhood and along the boardwalk. In this photograph, a participant poses for a portrait.

Photograph By Matías González, National Geographic Your Shot

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Astronomy Picture of the Day: October 23rd of 2017

NGC 4993: The Galactic Home of an Historic Explosion
Image Credit: NASA & ESA Explanation: That reddish dot -- it wasn't there before. It's the dot to the upper left of galaxy NGC 4993's center, do you see it? When scanning the large field of possible locations of an optical counterpart to the unprecedented gravitational wave event GW170817 in August, the appearance of this fading dot quickly became of historic importance. It pinpointed GW170817's exact location, thereby enabling humanity's major telescopes to examine the first ever electromagnetic wave counterpart to a gravitational wave event, an event giving strong evidence of being a short gamma-ray burst kilonova, the element-forming explosion that occurs after two neutron stars merge. The featured image of lenticular galaxy NGC 4993 by Hubble shows the fading dot several days after it was discovered. Analyses, continuing, include the physics of the explosion, what heavy elements formed, the similarity of the speeds of gravitational radiation and light, and calibrating a new method for determining the distance scale of our universe.

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National Geographic Photo of the Day: October 22nd of 2017

October 22, 2017 The ReefIn the Red Sea off the coast of Egypt, a freediver swims near an artificial reef shaped like an elephant. As coral reefs around the world are threatened, artificial reefs can be a boon to the underwater ecosystem, and an artistic take on one provides added enjoyment to underwater enthusiasts.
Photograph By Guillaume Bihet, National Geographic Your Shot

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Astronomy Picture of the Day: October 22nd of 2017

Two Black Holes Dancing in 3C 75
Image Credit: X-Ray: NASA/CXC/D. Hudson, T. Reiprich et al. (AIfA); Radio: NRAO/VLA/ NRL
Explanation: What's happening at the center of active galaxy 3C 75? The two bright sources at the center of this composite x-ray (blue)/ radio (pink) image are co-orbiting supermassive black holes powering the giant radio source 3C 75. Surrounded by multimillion degree x-ray emitting gas, and blasting out jets of relativistic particles the supermassive black holes are separated by 25,000 light-years. At the cores of two merging galaxies in the Abell 400 galaxy cluster they are some 300 million light-years away. Astronomers conclude that these two supermassive black holes are bound together by gravity in a binary system in part because the jets' consistent swept back appearance is most likely due to their common motion as they speed through the hot cluster gas at 1200 kilometers per second. Such spectacular cosmic mergers are thought to be common in crowded galaxy cluster environments in the distant universe. In their final stages the mergers are expected to be intense sources of gravitational waves.

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National Geographic Photo of the Day: August 29th of 2017

August 29, 2017

Morning Rooftops

Day begins in Varanasi, the holiest city in India for Hindus. Located on the banks of the holy river Ganges, millions of pilgrims visit each year to bathe in the sacred waters. "Being the oldest continuously inhabited city in India, Varanasi is chaotic and colorful, intense and frenetic," says Your Shot photographer Yan Li. "Although it is the holiest place for Hindus, the daily life of locals has no difference compared to ours."

Photograph By Yan Li, National Geographic Your Shot

Astronomy Picture of the Day: August 29th of 2017

Saturn in Blue and Gold
Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
Explanation: Why is Saturn partly blue? The featured picture of Saturn approximates what a human would see if hovering close to the giant ringed world. The image was taken in 2006 March by the robot Cassini spacecraft now orbiting Saturn. Here Saturn's majestic rings appear directly only as a thin vertical line. The rings show their complex structure in the dark shadows they create on the image left. Saturn's fountain moon Enceladus, only about 500 kilometers across, is seen as the bump in the plane of the rings. The northern hemisphere of Saturn can appear partly blue for the same reason that Earth's skies can appear blue -- molecules in the cloudless portions of both planet's atmospheres are better at scattering blue light than red. When looking deep into Saturn's clouds, however, the natural gold hue of Saturn's clouds becomes dominant. It is not known why southern Saturn does not show the same blue hue -- one hypothesis holds that clouds are higher there. It is also not known why Saturn's clouds are colored gold. Next month, Cassini will end its mission with a final dramatic dive into Saturn's atmosphere.