Now here's an interesting question:
Of all the astronomical discoveries over the years, which was the most profound? Which discovery, upon further examination, opened more new doors to philosophy, deep thought and science than any other?
Certainly the discovery that the Earth wasn't at the center of the solar system would be most people's pick, since it only relegated a couple thousand years of religious belief to the dust bin of history.
But when you think about it, that particular discovery didn't really alter our view of the cosmos; it was more just a matter of a small physical realignment in the immediate neighborhood. It certainly had religious repercussions, and certainly made calculating planetary orbits easier, but not much else. Switch the Sun and the Earth around and we still have no further idea what all those little twinkling lights up there are.
But in 1863, an Italian astronomer named Angelo Secchi invented the heliospectrograph, which breaks a star's light into its spectral bands. He eventually charted the light from almost 4,000 stars.
At one point, he turned it on the Sun and compared its chart to the others. And what a stunning moment.
Our Sun is a star.
To me, if there was one fulcrum point upon which our entire understanding of the cosmos turned, that was it.
Our Sun is a star.
I'm currently halfway through a terrific series on our solar system called Wonders of the Solar System. It's a 3-disc set; I got mine from Netflix. The following video is from the episode 'Empire of the Sun'. That's the only segue from above; the actual clip is specifically about the Earth. Very specifically, as you'll see.
Apart from the usual breathtaking photography and computer graphics, what makes it particularly enjoyable is the host, Dr. Brian Cox. Like the great science hosts of yore (Carl Sagan, James Burke, et al), Cox doesn't get bogged down in technical talk and he uses easy-to-understand examples of the physics he's describing. He also carries across that unabashed 'wonderment and awe' that Sagan used to wear on his sleeve. Nothin' wrong with that.
On the other hand, I'm no slouch with this cosmos stuff, m'self. Until I see otherwise, I believe my Life On Other Worlds: By The Numbers is the definitive work arguing against there being intelligent life on other worlds.
Which is why the following clip interested me. It's yet another link in the chain of events that are extremely unlikely to happen to the average planet.
Does the average planet have... a spinning molten iron core?
The full 1-hour episode is
here.
