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Malenfant
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That's pretty amazing, too. Too much amazing for one day! Ok, so when Scarecrow or Andrew do a pretty version, they'll have to add in a few dwarfs, as well ...
A Nice Illustration of Scale...
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They must have some wild summers around Antares.
That's just staggering. I always heard the term Red Giant, but never really thought about it.
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Malenfant
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This is pretty basic, but at least the sizes are correct...
The yellow speck at the top is the Sun (1 radius), then going down from that is Sirius (1.7r, white), Pollux (8.8r, orange), Arcturus (25r, dark orange), Aldebaran (40r, brown), Rigel (70r, blue-white), and then on the right is Betelgeuse (650r, light red) and on the left is Antares (1000r, dark red).
This view shows all of Betelgeuse (right) and Antares (left). The Sun isn't even visible in this view - the smallest orange speck visible is Pollux.
The yellow speck at the top is the Sun (1 radius), then going down from that is Sirius (1.7r, white), Pollux (8.8r, orange), Arcturus (25r, dark orange), Aldebaran (40r, brown), Rigel (70r, blue-white), and then on the right is Betelgeuse (650r, light red) and on the left is Antares (1000r, dark red).
This view shows all of Betelgeuse (right) and Antares (left). The Sun isn't even visible in this view - the smallest orange speck visible is Pollux.
TheEngineer
SOC-14 1K
Hi !
Mal, now that gives an even better oversight.
Thanks.
What I consider somehow fascinating is, that Antares "only" as around 17 times the mass of the sun.
regards,
Mert
Mal, now that gives an even better oversight.
Thanks.
What I consider somehow fascinating is, that Antares "only" as around 17 times the mass of the sun.
regards,
Mert
Reminds of a T-Shirt that used to be produced by the Royal Astronomical Society of Canada in which a composite of the Milky Way dominated with a large arrow pointing to an insignificant speck which said: "You Are Here."
Good image but the host site is pretty wacked. Protocals of the Elder Zion & Supporting Ernst Zundel together with books endorsing the cosmic consciousness...please.
Good image but the host site is pretty wacked. Protocals of the Elder Zion & Supporting Ernst Zundel together with books endorsing the cosmic consciousness...please.
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Malenfant
Guest
That's pretty massive as stars go. Don't forget, the Sun is more massive than about 80% of the stars in the universe. Stars that are more than 10 times the mass of the Sun are statistically very rare indeed.
The other fun thing is that Rigel and Antares are both considered to be "supergiants" (blue and red respectively), but look at the size difference between them! The difference is because Antares is at the end of its life, and Rigel is earlier in its evolution - Antares was once like Rigel, and Rigel will eventually be like Antares, and both will explode as supernovae.
The other interesting thing is that both stars are incredibly young. Antares is probably only about 10-12 million years old, and Rigel is a couple of million years younger. These stars weren't even around when the dinosaurs walked the earth!
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Malenfant
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No, the more massive the star, the shorter its life. The radius changes wildly throughout a star's lifespan - for example, just before the Sun becomes a tiny white dwarf at the end of its life, it'll be a red giant bigger than Rigel (but nowhere near as big as Betelgeuse). And Rigel and Antares started out as blue O V stars a few million years ago that were about the size of Pollux.
This article I wrote on my website might explain something to you about how stars evolve over time:
http://www.evildrganymede.net/rpg/traveller/stellar.htm
This article I wrote on my website might explain something to you about how stars evolve over time:
http://www.evildrganymede.net/rpg/traveller/stellar.htm
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Malenfant
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Antares probably wouldn't have planets - apparently the most massive stars tend to blow away any gas and dust before they have a chance to form planets. EVen if it could form planets, they'd basically still be in the process of forming by the time the star exploded as a supernova so they'd be completely uninhabitable.
That said, the habitable zone at its current luminosity would be somewhere around 100 AU from the centre of the star (roughly three times as far as Pluto is from the sun). At that distance, Antares would look ten times as big in the sky as the sun does from Earth.
We got around that for the Antares Supernova project by putting the mainworld in orbit around a captured Brown Dwarf a thousand AU from the star.
That said, the habitable zone at its current luminosity would be somewhere around 100 AU from the centre of the star (roughly three times as far as Pluto is from the sun). At that distance, Antares would look ten times as big in the sky as the sun does from Earth.
We got around that for the Antares Supernova project by putting the mainworld in orbit around a captured Brown Dwarf a thousand AU from the star.
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Malenfant
Guest
And here are some stars that are closer to Sol's size...
Top row: Sirius A (1.7r), Altair (1.8r at equator), Procyon A (2.0r)
Bottom row: Alpha Centauri A (1.23r), Sol (1r), Epsilon Eridani (0.84r), Epsilon Indi (0.77r), Gliese 229 (0.59r), Ross 128 (0.2r), Barnard's Star (0.175r), Proxima Centauri (0.145r), Gliese 229B (brown dwarf, 0.0979r) Jupiter (planet, 0.089r), Sirius B (white dwarf, 0.0084r).
Earth would be roughly the same size as Sirius B (the tiny speck next to Jupiter).
Further information on these stars can be found at:
http://www.solstation.com/stars.htm
Top row: Sirius A (1.7r), Altair (1.8r at equator), Procyon A (2.0r)
Bottom row: Alpha Centauri A (1.23r), Sol (1r), Epsilon Eridani (0.84r), Epsilon Indi (0.77r), Gliese 229 (0.59r), Ross 128 (0.2r), Barnard's Star (0.175r), Proxima Centauri (0.145r), Gliese 229B (brown dwarf, 0.0979r) Jupiter (planet, 0.089r), Sirius B (white dwarf, 0.0084r).
Earth would be roughly the same size as Sirius B (the tiny speck next to Jupiter).
Further information on these stars can be found at:
http://www.solstation.com/stars.htm
far-trader
SOC-14 10K
Interesting. Altair is oblate. Is it a high rotational velocity? Or the influence of some close large bodies? Or uncertain?
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Malenfant
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Dunno. But the 100D limit for Antares is at 1000 AU., so it'd take a whileOriginally posted by Valarian:
And how long would it take to get to the 100d limit?
. That's another reason why we put the mainworld around a brown dwarf out there, because the 100D limit for that is considerably smaller... ships would aim for that rather than Antares itself. It's a fast rotator. Sol spins once every 25.4 days, Altair spins once every 10.4 hours - its rotational speed is about 210 km/s! So the equatorial radius is about 14% larger than the polar radius.
http://www.solstation.com/stars/altair.htm
BetterThanLife
SOC-14 1K
...unless the Ancients put one there so they'd have a great vacation spot. </font>[/QUOTE]If the Grandfather wanted to do that, wouldn't he put a ringworld there? After all in that case he could probably fit the entire population of the Known Universe on it.
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