24 JAN 2015 by ideonexus
Habitable Worlds as a Cause for Moral Reflection
In this great celestial creation, the catastrophy of a world, such as ours, or even the total dissolution of a system of worlds, may possibly be no more to the great Author of Nature, than the most common accident in life with us, and in all probability such final and general Doomsdays may be as frequent there, as even Birthdays or mortality with us upon the earth. This idea has something so chearful in it, that I own I can never look upon the stars without wondering why the whole world does ...24 JAN 2015 by ideonexus
Nemisis
Piet Hut, another Dutch astronomer fifty years younger than Jan Oort, decided to take seriously the possibility that comet showers are periodic. If they are periodic, the theory that they are caused by the random passing-by of alien stars cannot be right. If showers are periodic, they must be explained by a different theory. Piet Hut and his friend Rich Muller found an alternative theory to explain the periodicity in case it turns out to be real. The alternative theory is called Nemesis. Neme...Folksonomies: astronomy hypotheses
Folksonomies: astronomy hypotheses
21 SEP 2011 by ideonexus
Seeing How Species Arise is Similar to Understanding Star...
The way we discovered how species arise resembles the way
astronomers discovered how stars “evolve” over time. Both processes
occur too slowly for us to see them happening over our lifetime. But we
can still understand how they work by finding snapshots of the process
at different evolutionary stages and putting these snapshots together
into a conceptual movie. For stars, astronomers saw dispersed clouds
of matter (“star nurseries”) in galaxies. Elsewhere they saw those clouds condens...Just as astronomers search the skies for stars in varying stages of life, biologists look for species in varying degrees development.