Linked by Thom Holwerda on Thu 26th Aug 2010 23:24 UTC
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RE[6]: Are they still stuck in GHz race?
by Zifre on Sun 29th Aug 2010 11:40
in reply to "RE[5]: Are they still stuck in GHz race?"
So well-adapted that it believed for a long time that the Sun was gravitating around the Earth...
Before science was widespread, that seemed like a pretty good idea. There was no reason to believe otherwise. It's not like universal gravitation is obvious - we only ever see things falling toward the Earth.
And technically, space isn't absolute. The Sun really is orbiting the Earth just as much as the Earth is orbiting the Sun. We only consider the Sun to be the center because it is bigger.
RE[7]: Are they still stuck in GHz race?
by Drumhellar on Tue 31st Aug 2010 04:47
in reply to "RE[6]: Are they still stuck in GHz race?"
And technically, space isn't absolute. The Sun really is orbiting the Earth just as much as the Earth is orbiting the Sun. We only consider the Sun to be the center because it is bigger.
No, the Earth is orbiting the Sun, and not at all the other way around. This is because the barycenter of the Earth-Sun system is contained within the Sun. In order to say the Sun orbits the Earth, the barycenter would have to be located within the Earth.
If the barycenter was at a point that was between the two bodies, but not within either, it would be a binary system. This is the situation with Pluto. Instead of having a moon, Charon really makes Pluto-Charon a binary system, as their barycenter is external to either body.




Member since:
2010-03-08
So well-adapted that it believed for a long time that the Sun was gravitating around the Earth...