Constitution Of Uranus

One important fact is that Uranus, unlike the other giant planets, seems to have little internal heat. Jupiter radiates 1.7 times as much energy as it would do if it depended entirely upon what it receives from the Sun Saturn radiates 1.8 times as much and Neptune over 2. With Uranus, the upper limit is only 1.06, but with a possible uncertainty of 1 - so that there may be no excess energy at all. Moreover, the temperatures of Uranus and Neptune as measured from Earth are almost equal, even...

The History Of Astronomy

To give every date of importance in the history of astronomy would be a mammoth undertaking. What I have therefore tried to do is to make a judicious selection, separating out purely space-research advances and discoveries. It is impossible to say just when astronomy began, but even the earliest men capable of coherent thought must have paid attention to the various objects to be seen in the sky, so that it may be fair to say that astronomy is as old as Homo sapiens. Among the earliest peoples...

Info

The Danjon scale for lunar eclipses. 0 Very dark Moon almost invisible. 1 Dark grey or brownish colour details barely identifiable. 2 Dark or rusty-red, with a dark patch in the middle of the shadow brighter edges. 3 Brick-red sometimes a bright or yellowish border to the shadow. 4 Coppery or orange-red very bright, with a bluish cast and varied hues. depend upon the conditions in the Earth's atmosphere thus the eclipse of 19 March 1848 was so 'bright' that lay observers refused to...