Meteor Misses Galaxy #119 The galaxy was never in danger. For…

Meteor Misses Galaxy #119 The galaxy was never in danger. For one thing, the Triangulum galaxy (M33), pictured, is much bigger than the tiny grain of rock at the head of the meteor. For another, the galaxy is much farther away – in this instance 3 million light years as opposed to only about 0.0003 light seconds. Even so, the meteor’s path took it angularly below the galaxy. Also the wind high in Earth’s atmosphere blew the meteor’s glowing evaporative molecule train away from the galaxy, in angular projection. Still, the astrophotographer was quite lucky to capture both a meteor and a galaxy in a single exposure – which was subsequently added to two other images of M33 to bring up the spiral galaxy’s colors. At the end, the meteor was gone in a second, but the galaxy will last billions of years. via NASA https://apod.nasa.gov/apod/ap190430.html

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The Galaxy, the Jet and the Black Hole #119 Bright elliptical…

The Galaxy, the Jet and the Black Hole #119 Bright elliptical galaxy Messier 87 (M87) is home to the supermassive black hole captured by planet Earth’s Event Horizon Telescope in the first ever image of a black hole. Giant of the Virgo galaxy cluster about 55 million light-years away, M87 is the large galaxy rendered in blue hues in this infrared image from the Spitzer Space telescope. Though M87 appears mostly featureless and cloud-like, the Spitzer image does record details of relativistic jets blasting from the galaxy’s central region. Shown in the inset at top right, the jets themselves span thousands of light-years. The brighter jet seen on the right is approaching and close to our line of sight. Opposite, the shock created by the otherwise unseen receding jet lights up a fainter arc of material. Inset at bottom right, the historic black hole image is shown in context, at the center of giant galaxy and relativistic jets. Completely unresolved in the Spitzer image, the supermassive black hole surrounded by infalling material is the source of the enormous energy driving the relativistic jets from the center of active galaxy M87. via NASA https://apod.nasa.gov/apod/ap190427.html

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Behold the Southern Lights! #116 As the International Space…

Behold the Southern Lights! #116 As the International Space Station orbited 265 miles above the southern Indian Ocean about halfway between Madagascar and Antarctica, the crew snapped this image of the Aurora Australis. via NASA http://www.nasa.gov/image-feature/behold-the-southern-lights

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Messier 81 #119 One of the brightest galaxies in planet…

Messier 81 #119 One of the brightest galaxies in planet Earth’s sky is similar in size to our Milky Way Galaxy: big, beautiful Messier 81. Also known as NGC 3031 or Bode’s galaxy for its 18th century discoverer, this grand spiral can be found toward the northern constellation of Ursa Major, the Great Bear. The detailed telescopic view reveals M81’s bright yellow nucleus, blue spiral arms, pink starforming regions, and sweeping cosmic dust lanes. Some dust lanes actually run through the galactic disk (left of center), contrary to other prominent spiral features though. The errant dust lanes may be the lingering result of a close encounter between M81 and its smaller companion galaxy, M82. Scrutiny of variable stars in M81 has yielded one of the best determined distances for an external galaxy – 11.8 million light-years. via NASA https://apod.nasa.gov/apod/ap190417.html

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#43ap Wikipedia picture of the day on April 17, 2019: Opera…

#43ap Wikipedia picture of the day on April 17, 2019:
Opera Theatre, Yerevan, Armenia. The building, designed by the Armenian architect Alexander Tamanian, was officially opened in 1933 and consists of two concert halls: the Aram Khatchaturian concert hall with 1,400 seats and the Alexander Spendiaryan Opera and Ballet National Theatre with 1,200 seats.
Ópera, Ereván, Armenia, 2016-10-03, DD 13.jpg.

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First Horizon Scale Image of a Black Hole #119 What does a…

First Horizon Scale Image of a Black Hole #119 What does a black hole look like? To find out, radio telescopes from around the Earth coordinated observations of black holes with the largest known event horizons on the sky. Alone, black holes are just black, but these monster attractors are known to be surrounded by glowing gas. The first image was released yesterday and resolved the area around the black hole at the center of galaxy M87 on a scale below that expected for its event horizon. Pictured, the dark central region is not the event horizon, but rather the black hole’s shadow – the central region of emitting gas darkened by the central black hole’s gravity. The size and shape of the shadow is determined by bright gas near the event horizon, by strong gravitational lensing deflections, and by the black hole’s spin. In resolving this black hole’s shadow, the Event Horizon Telescope (ETH) bolstered evidence that Einstein’s gravity works even in extreme regions, and gave clear evidence that M87 has a central spinning black hole of about 6 billion solar masses. The EHT is not done – future observations will be geared toward even higher resolution, better tracking of variability, and exploring the immediate vicinity of the black hole in the center of our Milky Way Galaxy. via NASA https://apod.nasa.gov/apod/ap190411.html

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Martian Moon Phobos Crosses the Sun #119 What’s that…

Martian Moon Phobos Crosses the Sun #119 What’s that passing in front of the Sun? It looks like a moon, but it can’t be Earth’s Moon, because it isn’t round. It’s the Martian moon Phobos. The featured video was taken from the surface of Mars late last month by the Curiosity rover. Phobos, at 11.5 kilometers across, is 150 times smaller than Luna (our moon) in diameter, but also 50 times closer to its parent planet. In fact, Phobos is so close to Mars that it is expected to break up and crash into Mars within the next 50 million years. In the near term, the low orbit of Phobos results in more rapid solar eclipses than seen from Earth. The featured video has been sped up – the actual transit took about 35 seconds. A similar video was taken of Mars’ smaller and most distant moon Diemos transiting the Sun. The videographer – the robotic rover Curiosity – continues to explore Gale crater, most recently an area with stunning vistas and unusual rocks dubbed Glen Torridon. via NASA https://apod.nasa.gov/apod/ap190410.html

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