Originally posted by Kinesis
51 Pegasi, Upsilon Andromedae, Epsilon Eridani, 55 Cancri, Rho Coronae Borealis, 16 Cygni B, 47 Ursae
Majoris, 14 Herculis and Tau Boötis.
Good that you brought up some interesting star systems. I figured I fill in some blanks:
Bold = There is a biosphere.
Blue = Colony is present.
Green = Actual alien homeworld, not colony.
If you stated 61 Cygni A, there would have been two up there that are marked with green, but you listed the 'B' component.
Originally posted by angelc01
Hello WFA -- I do not know if it has been mentiond on this thread but how about The Hyades cluster northern constelation Taurus [the bull] view this
There is mention there of a large planet capable of life. Of coures these are theories based on speculations from astronomers using the latest in
The Hyades cluster is a far better place to look for life compared to the Pleiades cluster (not that the latter should be excluded). Thanks for
bringing it up
Originally posted by SageOfWisdom
Little bit of debunking, Pleiades open star cluster is less than 100 million years old, Too young for intelligent life, and before you say life
migrated there. most stars in the cluster are B class, most likely too hot for life to be supported.
I have studied the Pleiades cluster members, and there seem to be quite a few stars that are F, G and K-class. Most of them are foreground or
background stars, but I imagine an ET species would rather mention the cluster (easier to find, associate), than any specific stars there.
Age means little to a colonizing species. If they found a way to traverse hundreds of light years distance in space, I think they would have some
technology to terraform young hot planets and shield themselves from excessive radiation.
I'm not a proponent of the Pleiadian thing and the stars these beings claim to hail from (actual Pleiades members, like Taygeta or Alcyone), but in
all honesty, the rest of the 1000 and so stars cannot be so easily excluded. Just playing the field more fairly.
Sirius is also too hot, and the gravity from Sirius B also makes life seemingly impossible.
Like I said above, I'm sure colonizers (as the hailers from Sirius claim to be), are capable of shielding themselves from the radiation. Also, Sirius
B was once an F-class star, nothing says a civilization couldn't have had colonies there before the star went in its giant phase and then shrunk to a
white dwarf. Don't forget Sirius C, a dim, low mass red dwarf orbiting Sirius A (any planets orbiting that red dwarf would only experience the
effects of 'A' on periodic basis, because they revolve rapidly around its parent star, the red dwarf).
And another thing - Recent studies suggest that white dwarfs can last almost more than half their previous, main sequence lifetime lasted, which is
5-6 billion years of cooling down period, for stars like our Sun, when they shed their lair. The same studies, suggest that after the initial ejection
of mass, the orbits of inner planets shift outward, and the materials that were blown shift inward, causing in some models for a new habitable planet
to form, if the right mixture happens. The only difference to our sun would be that it would shine more white light, and the light wouldn't be coming
from a big circle like the sun, but from a small star-like dot on the sky.
Pollux however, is a good candidate for life IMO.
I don't see under which criteria is this star system better than any others (i'm puzzled, as this system was mentioned a couple of times, if not
more, in this thread, so I'm amazed how people draw these criteria ... Is it because of the planet in orbit?)
Originally posted by yeti101
SageofWisdom, sorry but Gliese 581 is an M class star the more we learn about these stars and the planets in the HZ the less likely they are to
develop complex life.
to say they are problematic would be an understatement. Any planet in the HZ will be tidally locked like the moon is to earth. One side in eternal
sunlight the other in darkness. Recent calculations on the tidal forces exterted on these planets by the parent star are MASSIVE. Were talking
collosal disruption to the interior and surface.
Theyre more likely to have a global magma ocean than a water one like ours. Sucks considering they make up 90% of the stars in our galaxy.
Recent models suggest that life around red dwarfs might not face such negative impacts as previously thought. In fact, planets around it, even though
tidally locked, would have more or less, Earth-like characteristics, although they may be slightly more storm-generating. Even the solar flares don't
seem to be much of a problem.