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Eerie Earth and Spooky Space - It's Halloween #923893
10/22/17 05:21 AM
10/22/17 05:21 AM
Joined: May 2010
Posts: 7,150
United Kingdom
Mona - Astronomy Online content OP
BellaOnline Editor
Mona - Astronomy  Online Content OP
BellaOnline Editor
Chimpanzee
Joined: May 2010
Posts: 7,150
United Kingdom
Halloween falls midway between an equinox and a solstice. In the ancient Celtic world it was the new year's eve and start of winter - time to prepare for survival in the darkening days. But also a time when the boundary between our world and the otherworld weakened. Who knew what might cross it?

Halloween


Mona Evans
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Cosmic Halloween Tour [Re: Mona - Astronomy] #923973
10/25/17 12:44 PM
10/25/17 12:44 PM
Joined: May 2010
Posts: 7,150
United Kingdom
Mona - Astronomy Online content OP
BellaOnline Editor
Mona - Astronomy  Online Content OP
BellaOnline Editor
Chimpanzee
Joined: May 2010
Posts: 7,150
United Kingdom
Join me on a Halloween astronomical tour. See a cosmic witch and cosmic ghosts, spiders and snakes, and fiery skull. But have no fear. It's a virtual tour, and all these objects are a very long way away.

Cosmic Halloween Tour

Last edited by Mona - Astronomy; 10/30/17 05:33 AM.

Mona Evans
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A cosmic jack-o'-lantern? [Re: Mona - Astronomy] #924003
10/27/17 05:15 AM
10/27/17 05:15 AM
Joined: May 2010
Posts: 7,150
United Kingdom
Mona - Astronomy Online content OP
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Mona - Astronomy  Online Content OP
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Chimpanzee
Joined: May 2010
Posts: 7,150
United Kingdom
A cosmic jack-o'-lantern? It looks somewhat like a jack-o'-lantern might appear after a few Halloween drinkies. But you've probably guessed that it's the Sun. The bright parts are active regions which show up clearly in this blend of 171 and 193 ångström light courtesy of NASA's Solar Dynamics Observatory.

October 8, 2014,
Credit: NASA/GSFC/SDO

Last edited by Mona - Astronomy; 10/30/17 05:33 AM.

Mona Evans
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Little Ghost Nebula [Re: Mona - Astronomy] #924029
10/28/17 05:30 AM
10/28/17 05:30 AM
Joined: May 2010
Posts: 7,150
United Kingdom
Mona - Astronomy Online content OP
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Mona - Astronomy  Online Content OP
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Chimpanzee
Joined: May 2010
Posts: 7,150
United Kingdom
in the constellation Ophiuchus, the Little Ghost Nebula (NGC 6369) surrounds a faint dying star as a small, ghostly cloud. It was discovered by 18th century astronomer William Herschel. Because of its round shape, it looked rather like a planet in his telescope, so Herschel called it a planetary nebula.

No planets are involved in the creation of a planetary nebula. When sunlike stars use up their nuclear fuel, the outer layers expand into space while the core collapses into a white dwarf. You can see the white dwarf star near the center of the nebula.

Last edited by Mona - Astronomy; 10/30/17 05:34 AM.

Mona Evans
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Cosmic Ghosts Ghouls and Vampires [Re: Mona - Astronomy] #924072
10/30/17 05:31 AM
10/30/17 05:31 AM
Joined: May 2010
Posts: 7,150
United Kingdom
Mona - Astronomy Online content OP
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Chimpanzee
Joined: May 2010
Posts: 7,150
United Kingdom
Astronomers use colorful language for cosmic objects. But unlike ghosts, ghouls and vampires in horror stories, the cosmic ones aren't scary late at night. Here are tales of the birth, evolution and death of stars, a blinking demon and a star that, at Halloween, seems like the Sun's ghost.

Cosmic Ghosts Ghouls and Vampires


Mona Evans
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Greetings from Expedition 53 on the Space Station [Re: Mona - Astronomy] #924090
10/31/17 05:38 AM
10/31/17 05:38 AM
Joined: May 2010
Posts: 7,150
United Kingdom
Mona - Astronomy Online content OP
BellaOnline Editor
Mona - Astronomy  Online Content OP
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Chimpanzee
Joined: May 2010
Posts: 7,150
United Kingdom
Italian Astronaut Paolo Nespoli on board the International Space station sends greetings: Happy Halloween from Expedition 53!

Now that I can literally walk on the "ceiling" I can finally be what I was meant to be... Spiderman! Happy #Halloween! 👻

Credits: ESA/NASA


Mona Evans
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Ghost Nebula [Re: Mona - Astronomy] #924101
10/31/17 06:24 PM
10/31/17 06:24 PM
Joined: May 2010
Posts: 7,150
United Kingdom
Mona - Astronomy Online content OP
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Mona - Astronomy  Online Content OP
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Chimpanzee
Joined: May 2010
Posts: 7,150
United Kingdom
The Ghost Nebula (vdB 141) is a reflection nebula in the constellation Cepheus . Several stars are embedded in the nebula - that's what gives it the unsettling brown color. The photo was taken at Kitt Peak National Observatory.

Image Credit: T.A. Rector/University of Alaska Anchorage, H. Schweiker/WIYN and NOAO/AURA/NSF

Last edited by Mona - Astronomy; 11/01/17 04:11 AM.

Mona Evans
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Re: Ghost Nebula [Re: Mona - Astronomy] #924106
10/31/17 09:13 PM
10/31/17 09:13 PM
Joined: Apr 2002
Posts: 4,943
A
Angie Offline
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A
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Mona, that looks like a ghost. Wow!


Moderated by  Mona - Astronomy 

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