Observatories Combine to Crack Open the Crab Nebula

Colorful New Portrait Shows Energetic Details Embedded in Supernova Remnant
In the summer of the year 1054 AD, Chinese astronomers saw a new "guest star," that appeared six times brighter than Venus. So bright in fact, it could be seen during the daytime for several months. Halfway around the world, Native Americans made pictographs of a crescent moon with the bright star nearby that some think may also have been a record of the supernova.

This "guest star" was forgotten about until 700 years later with the advent of telescopes. Astronomers saw a tentacle-like nebula in the place of the vanished star and called it the Crab Nebula. Today we know it as the expanding gaseous remnant from a star that self-detonated as a supernova, briefly shining as brightly as 400 million suns. The explosion took place 6,500 light-years away. If the blast had instead happened 50 light-years away it would have irradiated Earth, wiping out most life forms.

In the late 1960s astronomers discovered the crushed heart of the doomed star, an ultra-dense neutron star that is a dynamo of intense magnetic field and radiation energizing the nebula. Astronomers therefore need to study the Crab Nebula across a broad range of electromagnetic radiation, from X-rays to radio waves. This composite picture from five observatories captures the complexity of this tortured-looking supernova remnant.

via Hubble - News feed
http://hubblesite.org/news_release/news/2017-21

Observatories combine to crack open the Crab Nebula

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Astronomers have produced a highly detailed image of the Crab Nebula, by combining data from telescopes spanning nearly the entire breadth of the electromagnetic spectrum.
via Science Daily
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Waves of lava seen in Jupiter's moon Io's largest volcanic crater

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The most active volcanic crater in the solar system, Loki Patera on Jupiter's moon Io, is thought to be a lava lake that periodically brightens because of overturning lava. A UC Berkeley team regularly monitors Io, and took advantage of a rare 2015 event, Europa passing in front of Io, to map the surface of the lake in detail. They found evidence for two massive waves of overturning lava converging toward the lake's southeast corner.
via Science Daily
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Trilobites: Why Trappist-1’s 7 Worlds Don’t Scatter: A Harmony Is at Work

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Astronomers can now explain why the recently discovered Earth-size planets, tightly packed, don’t simply fly apart. And now, you can give it a listen.
via New York Times

UGC 1810: Wildly Interacting Galaxy from Hubble

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What's happening to this spiral galaxy? Although details remain uncertain, it surely has to do with an ongoing battle with its smaller galactic neighbor. The featured galaxy is labelled UGC 1810 by itself, but together with its collisional partner is known as Arp 273. The overall shape of the UGC 1810 -- in particular its blue outer ring -- is likely a result of wild and violent gravitational interactions. This ring's blue color is caused by massive stars that are blue hot and have formed only in the past few million years. The inner galaxy appears older, redder, and threaded with cool filamentary dust. A few bright stars appear well in the foreground, unrelated to UGC 1810, while several galaxies are visible well in the background. Arp 273 lies about 300 million light years away toward the constellation of Andromeda. Quite likely, UGC 1810 will devour its galactic sidekick over the next billion years and settle into a classic spiral form.

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