Hi Izzy,
We all loved uncle Carl Sagan on Johnny Carson telling us that there were "billions and billions of galaxies" seething with life containing planets. But old Carl, the science mafia mouthpiece, based his extrapolations on a theory of planetary formation that now has more holes than a wheel of swiss cheeze in a Baghdad ambush.
The disk accretion theory of planetary formation is dying a slow, reluctant death in the face of new data from observed solar systems. ALL systems discovered so far consist of large Jupiter, Saturn proto-sun bodies revolving very close to the parent star. These should really be considered binary star systems since the satellite body is so huge.
Disk accretion in no way accounts for the enigmatic "asteroid belt", the retrograde rotation of Venus, the various tilted axes of the planets or the lack of uniformity of impact craters- Moon, heavily impacted; Venus, Mars, no impacts, Mercury, heavily impacted; some planetary moons impacted (find a picture of Mimas!), some not, the lack of circularity of the planetary orbits, their interval distances from the sun, the size and composition of the planets themselves, and many other observations of the solar system that are exceptions to the disk accretion theory. Basically it's "disk accretion" is one huge duct tape and tie strap kluge, almost as stupid as "dark matter".
There is a competing theory of planetary formation first hypothesized by Immanuel Velikovsky in his best seller, "Worlds in Collision"- that planets can be ejected from the heart of a sun due to changes in the electrical properties of the sun interacting with the plasma Birkland currents of the parent galaxy (Try to explain the "barred spiral galaxy" in gravitational terms). Do a search on the term "electric universe" and discover that there are entire branches of science that need to be radically pruned in order to conform to observation.
Walter
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walter alter artist - wiseguy - savant
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You are too funny. It's been years since I've encountered anyone who takes Velikovsky seriously! Also, check your facts about impacts. Every solid surfcaed plannet and moon has them in abundance, even Earth. also check you knowledge of other solar systems. Our detection techniques can only detect the types of systems you describe, not all possible systems.