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Astronomy Picture of the Day - Alpha Centauri: The Closest Star System
NASA ^ | 1 Jan, 2025 | Image Credit & Copyright: Telescope Live, Heaven's Mirror Observatory; Processing: Chris Cantrell

Posted on 01/01/2025 12:23:34 PM PST by MtnClimber

Explanation: The closest star system to the Sun is the Alpha Centauri system. Of the three stars in the system, the dimmest -- called Proxima Centauri -- is actually the nearest star. The bright stars Alpha Centauri A and B form a close binary as they are separated by only 23 times the Earth- Sun distance - slightly greater than the distance between Uranus and the Sun. The Alphasystem is not visible in much of the northern hemisphere. Alpha Centauri A, also known as Rigil Kentaurus, is the brightest star in the constellation of Centaurus and is the fourth brightest star in the night sky. Sirius is the brightest even though it is more than twice as far away. By an exciting coincidence, Alpha Centauri A is the same type of star as our Sun, and Proxima Centauri is now known to have a potentially habitable exoplanet.


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: alphacentauria; alphacentaurib; apod; astronomy; centaurus; nasa; proximacentauri; rigilkentaurus; science; xplanets
To be added or removed from the Astronomy Picture of the Day ping list please send me a request via "Private Reply" (Mail).

For more detail go to the link and click on the image for a high definition image. You can then move the magnifying glass cursor then click to zoom in and click again to zoom out. When zoomed in you can scan by moving the side bars on the bottom and right side of the image.

1 posted on 01/01/2025 12:23:34 PM PST by MtnClimber
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To: MtnClimber

2 posted on 01/01/2025 12:23:56 PM PST by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: MtnClimber

3 posted on 01/01/2025 12:24:15 PM PST by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: 21stCenturion; 21twelve; 4everontheRight; A Navy Vet; A_perfect_lady; abb; AFB-XYZ; AFPhys; ...
Pinging the APOD list

🪐 🌟 🌌 🍔

4 posted on 01/01/2025 12:25:15 PM PST by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: MtnClimber

Wow.


5 posted on 01/01/2025 12:25:41 PM PST by No name given ( Anonymous is who you’ll know me as)
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To: MtnClimber
The (unreached) destination of the Robinson family, Major West, and Dr. Smith in the 1960's TV series, Lost in Space.
6 posted on 01/01/2025 12:44:34 PM PST by fidelis (Ecce Crucem Domini! Fugite partes adversae! Vicit Leo de tribu Juda, Radix David! Alleluia!)
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To: fidelis

In the final season of “Lost in Space,” the Robinson family successfully reaches their destination, Alpha Centauri, but not without significant challenges; the ending sees Will and the Robot venturing out to explore the galaxy together, signifying a new chapter for them, while the rest of the family settles into their new life on the planet, with a hopeful and somewhat bittersweet tone, implying that their journey is not truly over.


7 posted on 01/01/2025 12:47:29 PM PST by BipolarBob (I injured myself measuring radio frequencies. It still Hertz.)
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To: MtnClimber

Howdy, neighbors!


8 posted on 01/01/2025 12:58:05 PM PST by telescope115 (I NEED MY SPACE!!! 🔭)
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To: MtnClimber

I never heard of the star Chris Cantrell.

I heard of the star Jerry Cantrell.

Does Chris Cantrell emit signals that sound like Alice In Chains tunes?

…ok, I’ll go away now…


9 posted on 01/01/2025 1:10:18 PM PST by DoodleBob (Gravity's waiting period is about 9.8 m/s² )
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To: BipolarBob
That doesn't sound like that is from the original series--do you happen to know the name of the episode?

There is an episode in the final season where they were fooled into believing they had landed on one of the planets of AC by a bunch of aliens disguised as young 60's earth hippies. That episode was called, "The Promised Planet."

10 posted on 01/01/2025 1:18:34 PM PST by fidelis (Ecce Crucem Domini! Fugite partes adversae! Vicit Leo de tribu Juda, Radix David! Alleluia!)
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To: MtnClimber

At Apollo/Saturn V speeds it would take about 115,000 years to get there. Pick up a few gravity assists along the way (AKA “slingshotting”) and you could cut that to 80,000 years.

Except that once you got there you’d need a gazillion tons more fuel to slow down because brakes don’t work in space.


11 posted on 01/01/2025 2:05:51 PM PST by Paal Gulli
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To: Paal Gulli

I think we need to develop a whole different kind of getting-from-to-there technology.
😀 🤔 🤓


12 posted on 01/01/2025 2:28:12 PM PST by Reynoldo (BurnLootMurder)
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To: MtnClimber

What’s that red thing directly below Alpha?

And a reddish HII region at 9:00?


13 posted on 01/01/2025 4:38:03 PM PST by FroggyTheGremlim (Hail to Pitt!)
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To: Reynoldo
"I think we need to develop a whole different kind of getting-from-to-there technology."

Space isn't empty space and hitting even a hydrogen atom with sufficient velocity would be deadly. Physically rocketing through space faster than about 1/10th the speed of light (30,000 km/s) might be impossible because the force of the collision with a standard size grain of sand (0.00440 grams) would be equivalent to the detonation of a bit more than 1000 lbs of TNT.

Short of folding space or learning to control worm holes (or some other form of interdimensional wizardry), 30,000 km/s might be as fast as we ever get. Even that fast Proxima Centauri is still 45 years away.

14 posted on 01/01/2025 6:32:39 PM PST by Paal Gulli
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To: MtnClimber

This one is a great find.


15 posted on 01/01/2025 11:10:24 PM PST by higgmeister (In the Shadow of The Big Chicken! )
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To: annie laurie; Knitting A Conundrum; Viking2002; Ernest_at_the_Beach; Mmogamer; fragrant abuse; ...
· join · view topics · view or post blog · bookmark ·
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Google news searches: exoplanet · exosolar · extrasolar ·
X-Planets

16 posted on 01/02/2025 8:14:19 AM PST by SunkenCiv (Putin should skip ahead to where he kills himself in the bunker.)
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To: fidelis; BipolarBob

Source of the confusion may be that the described finale was from the second series. The original series I think just got cancelled, no big finish.

Original series, The Promised Planet:
https://www.imdb.com/title/tt0636237/?ref_=ttep_ep19

Netflix reboot, Trust
https://www.imdb.com/title/tt13675378/?ref_=ttep_ep8


17 posted on 01/02/2025 8:25:11 AM PST by SunkenCiv (Putin should skip ahead to where he kills himself in the bunker.)
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To: SunkenCiv; BipolarBob
Source of the confusion may be that the described finale was from the second series. The original series I think just got cancelled, no big finish.

Thanks, SC.

18 posted on 01/02/2025 9:18:58 AM PST by fidelis (Ecce Crucem Domini! Fugite partes adversae! Vicit Leo de tribu Juda, Radix David! Alleluia!)
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