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Halloween #933237 10/20/20 02:02 PM
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Mona - Astronomy Offline OP
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Autumn equinox and autumn sky, discoveries and discoverers, an ancient festival that marked the transition from the light to darkness. Can you identify them?

Autumn Equinox to Halloween – Quiz


Mona Evans
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Re: Halloween [Re: Mona - Astronomy] #933241 10/21/20 06:55 AM
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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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Re: Halloween [Re: Mona - Astronomy] #933253 10/23/20 09:31 PM
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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


Mona Evans
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Re: Halloween [Re: Mona - Astronomy] #933254 10/23/20 09:33 PM
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Thousands of years ago a comet broke up. A remnant of it still visits Earth, adding to the debris stream fuelling the annual Taurid meteor shower. The shower peaks near Halloween and may produce brilliant meteors – its nickname is 'Halloween Fireballs'. But is there something deadly in the debris?

Taurids - Halloween Fireballs


Mona Evans
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Re: Halloween [Re: Mona - Astronomy] #933267 10/26/20 07:13 AM
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Hello Mona,

You continue to do an amazing job! Thank you - I loved and reacted in wonderment to your Cosmic Halloween Tour, the skies above just continues to make words like awesome really useful!

Cheers and here is to all finding TREATS and not TRICKS this Halloween ... Covid has resulted in all the tricks anybody needs forever.


Lestie Mulholland
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Re: Halloween [Re: Lestie4containergardens] #933280 10/29/20 03:09 PM
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Lestie, thank you so much for your kind words. I'm always happy when someone has enjoyed my work. I have one more Halloween article to post. I was so amused to keep coming across the spooky terminology astronomers sometimes use that I couldn't resist pulling them together for Halloween a few years ago.


Mona Evans
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Re: Halloween [Re: Mona - Astronomy] #933282 10/30/20 06:29 AM
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Hello again,

Another plus (about what you do by encouraging us to look upwards and skywards), which is not easily defined though it should be, is that a person (or should I just say me?) is lifted and made more 'better' because that same person is part of something so great and mysterious. Of course too, this person is most likely to be a non-Astronomer! Nevertheless, this person feels more powerful and able because this person plays, in some way, on this playing field.

Hopefully, this person has articulated this thought clearly enough.


Lestie Mulholland
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Re: Halloween [Re: Mona - Astronomy] #933283 10/30/20 10:09 AM
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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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Re: Halloween [Re: Mona - Astronomy] #933290 10/31/20 07:25 AM
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Hello Mona,

I am getting to visit you more often these days ... and have to concentrate when I'm reading about this wondrous subject but I've said that before.

You did make me smile though at this comment from the Ghouls bit ...

"It contains a small cluster of newborn stars, and they are big babies. Each one is between ten and twenty times the mass of the Sun."

Only an astronomer could say something like that in such a matter of fact way, you know, like "I had some cake for tea yesterday."

Ag ja, thanks again.


Lestie Mulholland
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Re: Halloween [Re: Mona - Astronomy] #933296 11/01/20 12:01 AM
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Halloween greetings from the European Southern Observatory (ESO) whose Very Large Telescope (VLT) has photographed the Skull Nebula.

Quote
This ethereal remnant of a long dead star bears an uneasy resemblance to a skull floating through space. The eerie Skull Nebula is showcased in this new image in beautiful bloodshot colours. This planetary nebula is the first known to be associated with a pair of closely bound stars orbited by a third outer star.

Also known as NGC 246, the Skull Nebula lies about 1600 light-years away from Earth in the southern constellation of Cetus (The Whale). It formed when a Sun-like star expelled its outer layers in its old age, leaving behind its naked core — a white dwarf — one of two stars that can be seen at the very centre of NGC 246.


Mona Evans
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