retrograde
esiegel | October 17, 2013"It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters." -Friedrich Nietzsche
Although the innermost planets, from Mercury through Saturn, were known since ancient times, it's only since the advent of the telescope that we've discovered what really lives in our Solar System. Over the past four centuries, the wonders of not only the distant Universe, but also our nearby neighborhood, have been uncovered in spectacular detail.
Image credit: NASA and – I believe – G. Bacon (STScI).
The third and fourth largest planets were…
esiegel | August 12, 2013"There is an ancient saying among men that you cannot thoroughly understand the life of mortals before the man has died, then only can you call it good or bad." -Sophocles
Imagine looking up at the night sky -- able to survey the full depths of space -- with eyes the size of saucers instead of our paltry, few-millimeter-sized pupils. What do you suppose you'd see? Well, here on Messier Monday, we take a journey through the first catalogue to effectively do just that! Charles Messier catalogued, over many years in the late 18th Century, 110 deep-sky objects, each unique, and each telling its…