The Expanding Echoes of Supernova 1987A #119 Can you find…

The Expanding Echoes of Supernova 1987A #119 Can you find supernova 1987A? It isn’t hard – it occurred at the center of the expanding bullseye pattern. Although this stellar detonation was first seen in 1987, light from SN 1987A continued to bounce off clumps of interstellar dust and be reflected to us even many years later. Light echoes recorded between 1988 and 1992 by the Anglo Australian Telescope (AAT) in Australia are shown moving out from the position of the supernova in the featured time-lapse sequence. These images were composed by subtracting an LMC image taken before the supernova light arrived from later LMC images that included the supernova echo. Other prominent light echo sequences include those taken by the EROS2 and SuperMACHO sky monitoring projects. Studies of expanding light echo rings around other supernovas have enabled more accurate determinations of the location, date, and symmetry of these tremendous stellar explosions. Yesterday marked the 32nd anniversary of SN 1987A: the last recoded supernova in or around our Milky Way Galaxy, and the last to be visible to the unaided eye. via NASA https://apod.nasa.gov/apod/ap190224.html

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The Stars of the Triangulum Galaxy #119 Like grains of sand on…

The Stars of the Triangulum Galaxy #119 Like grains of sand on a cosmic beach, stars of the Triangulum Galaxy are resolved in this sharp mosaic from the Hubble Space Telescope’s Advanced Camera for Surveys (ACS). The inner region of the galaxy spanning over 17,000 light-years is covered at extreme resolution, the second largest image ever released by Hubble. At its center is the bright, densely packed galactic core surrounded by a loose array of dark dust lanes mixed with the stars in the galactic plane. Also known as M33, the face-on spiral galaxy lies 3 million light-years away in the small northern constellation Triangulum. Over 50,000 light-years in diameter, the Triangulum Galaxy is the third largest in the Local Group of galaxies after the Andromeda Galaxy (M31), and our own Milky Way. Of course, to fully appreciate the Triangulum’s stars, star clusters, and bright nebulae captured in this Hubble mosaic, you’ll need to use a zoom tool. via NASA https://apod.nasa.gov/apod/ap190223.html

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#43ap Wikipedia picture of the day on February 22,…

#43ap Wikipedia picture of the day on February 22, 2019:
Sunflower at a field in Köcking, market town Eberndorf, district Völkermarkt, Carinthia, Austria, EU
Eberndorf Köcking Sonnenblumenfeld Biohof Tomic 18072014 0792.jpg.

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Dragon Aurora over Iceland #119 Have you ever seen a dragon in…

Dragon Aurora over Iceland #119 Have you ever seen a dragon in the sky? Although real flying dragons don’t exist, a huge dragon-shaped aurora developed in the sky over Iceland earlier this month. The aurora was caused by a hole in the Sun’s corona that expelled charged particles into a solar wind that followed a changing interplanetary magnetic field to Earth’s magnetosphere. As some of those particles then struck Earth’s atmosphere, they excited atoms which subsequently emitted light: aurora. This iconic display was so enthralling that the photographer’s mother ran out to see it and was captured in the foreground. No sunspots have appeared on the Sun so far in February, making the multiple days of picturesque auroral activity this month somewhat surprising. via NASA https://apod.nasa.gov/apod/ap190218.html

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NGC 2359: Thor s Helmet #119 NGC 2359 is a helmet-shaped cosmic…

NGC 2359: Thor s Helmet #119 NGC 2359 is a helmet-shaped cosmic cloud with wing-like appendages popularly called Thor’s Helmet. Heroically sized even for a Norse god, Thor’s Helmet is about 30 light-years across. In fact, the helmet is more like an interstellar bubble, blown as a fast wind from the bright, massive star near the bubble’s center inflates a region within the surrounding molecular cloud. Known as a Wolf-Rayet star, the central star is an extremely hot giant thought to be in a brief, pre-supernova stage of evolution. NGC 2359 is located about 15,000 light-years away in the constellation Canis Major. The remarkably detailed image is a mixed cocktail of data from broadband and narrowband filters that captures natural looking stars and the glow of the nebula’s filamentary structures. It highlights a blue-green color from strong emission due to oxygen atoms in the glowing gas. via NASA https://apod.nasa.gov/apod/ap190216.html

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Plane Crossing a Crescent Moon #119 No, this is not a good way…

Plane Crossing a Crescent Moon #119 No, this is not a good way to get to the Moon. What is pictured is a chance superposition of an airplane and the Moon. The contrail would normally appear white, but the large volume of air toward the setting Sun preferentially knocks away blue light, giving the reflected trail a bright red hue. Far in the distance, well behind the plane, is a crescent Moon, also slightly reddened. Captured a month ago above Valais, Switzerland, the featured image was taken so soon after sunset that planes in the sky were still in sunlight, as were their contrails. Within minutes, unfortunately, the impromptu sky show ended. The plane crossed the Moon and moved out of sight. The Moon set. The contrail became unilluminated and then dispersed. via NASA https://apod.nasa.gov/apod/ap190212.html

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Moon, Four Planets, and Emu #119 A luminous Milky Way falls…

Moon, Four Planets, and Emu #119 A luminous Milky Way falls toward the horizon in this deep skyscape, starting at the top of the frame from the stars of the Southern Cross and the dark Coalsack Nebula. Captured in the dark predawn of February 2nd from Central Victoria, Australia, planet Earth, the 26 day old waning crescent Moon still shines brightly near the horizon. The second and third brightest celestial beacons are Venus and Jupiter along the lower part of the Milky Way’s central bulge. Almost in line with the brighter planets and Moon, Saturn is the pinprick of light just visible below and right of the lunar glow. Australia’s first astronomers saw the elongated, bulging shape of the familiar Milky Way as a great celestial Emu. The Moon and planets could almost be the Emu’s eggs on this starry night. via NASA https://apod.nasa.gov/apod/ap190208.html

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Moon and Venus Appulse over a Tree #119 What’s that…

Moon and Venus Appulse over a Tree #119 What’s that bright spot near the Moon? Venus. About a week ago, Earth’s Moon appeared unusually close to the distant planet Venus, an angular coincidence known as an appulse. Similar to a conjunction, which is a coordinate term, an appulse refers more generally to when two celestial objects appear close together. This Moon and Venus appulse – once as close as 0.05 degrees – was captured rising during the early morning behind Koko crater on the island of O’ahu in Hawaii, USA. The Moon was in a crescent phase with its lower left reflecting direct sunlight, while the rest of the Moon is seen because of Earthshine, sunlight first reflected from the Earth. Some leaves and branches of a foreground kiawe tree are seen in silhouette in front of the bright crescent, while others, in front of a darker background, appear white because of forward scattering. Appulses involving the Moon typically occur several times a year: for example the Moon is expected to pass within 0.20 degrees of distant Saturn on March 1. via NASA https://apod.nasa.gov/apod/ap190206.html

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Star Formation in the Orion Nebula #116 The powerful wind from…

Star Formation in the Orion Nebula #116 The powerful wind from the newly formed star at the heart of the Orion Nebula is creating the bubble and preventing new stars from forming. via NASA http://www.nasa.gov/image-feature/star-formation-in-the-orion-nebula

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Henize 70: A Superbubble in the LMC #119 Massive stars…

Henize 70: A Superbubble in the LMC #119 Massive stars profoundly affect their galactic environments. Churning and mixing interstellar clouds of gas and dust, stars – most notably those upwards of tens of times the mass of our Sun – leave their mark on the compositions and locations of future generations of stars. Dramatic evidence of this is illustrated in our neighboring galaxy, the Large Magellanic Cloud (LMC), by the featured nebula, Henize 70 (also known as N70 and DEM301). Henize 70 is actually a luminous superbubble of interstellar gas about 300 light-years in diameter, blown by winds from hot, massive stars and supernova explosions, with its interior filled with tenuous hot and expanding gas. Because superbubbles can expand through an entire galaxy, they offer humanity a chance to explore the connection between the lifecycles of stars and the evolution of galaxies. via NASA https://apod.nasa.gov/apod/ap190204.html

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Twin Galaxies in Virgo #119 Spiral galaxy pair NGC 4567 and NGC…

Twin Galaxies in Virgo #119 Spiral galaxy pair NGC 4567 and NGC 4568 share this sharp cosmic vista with lonely elliptical galaxy NGC 4564. All are members of the large Virgo Galaxy Cluster. With their classic spiral arms, dust lanes, and star clusters, the eye-catching spiral pair is also known as the Butterfly Galaxies or the Siamese Twins. Very close together, the galaxy twins don’t seem to be too distorted by gravitational tides. Their giant molecular clouds are known to be colliding though and are likely fueling the formation of massive star clusters. The galaxy twins are about 52 million light-years distant, while their bright cores appear separated by about 20,000 light-years. Of course, the spiky foreground stars lie within our own Milky Way. via NASA https://apod.nasa.gov/apod/ap190201.html

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