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Hubble’s Cosmic Search for a Missing Arm

Bringing some of the mysteries of the universe a little closer to home.

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Owlscrying
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Joined: Mon Apr 03, 2017 3:21 am

Unread post Sat Dec 09, 2017 8:20 pm

Image
Credit: ESA/Hubble & NASA

This new picture of the week, taken by the NASA/ESA Hubble Space Telescope, shows the dwarf galaxy NGC 4625, located about 30 million light-years away in the constellation of Canes Venatici (The Hunting Dogs). The image, acquired with the Advanced Camera for Surveys (ACS), reveals the single major spiral arm of the galaxy, which gives it an asymmetric appearance. But why is there only one such spiral arm, when spiral galaxies normally have at least two?

Source / Image Courtesy

 

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Owlscrying
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Joined: Mon Apr 03, 2017 3:21 am

Unread post Sat Dec 09, 2017 8:22 pm



In the middle of the twentieth century, an unusual star was spotted in the constellation of Canes Venatici (Latin for 'hunting dogs'). Years later, astronomers determined that this object, dubbed AM Canum Venaticorum (or, AM CVn, for short), was, in fact, two stars. These stars revolve around each other every 18 minutes, and are predicted to generate gravitational waves - ripples in space-time predicted by Einstein.

Today, the name AM CVn represents a class of objects where one white dwarf star is pulling matter from a very compact companion star, such as a second white dwarf. (White dwarf stars are dense remains of Sun-like stars that have run out of fuel and collapsed to the size of the Earth.)

 

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