The night sky is dark
Moreover, since the Copernicansystem no longer requires that the stars be attached to a rotating celestialsphere, the stars can be…
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The night sky is dark
However, the cosmological model of Copernicus requirdistance to stars be very much larger than an astronomical unit; otherwise,the…
The night sky is dark 1
Why should it be paradoxical that the night sky is dark? Most of ussimply take for granted the fact that daytime is bright and nig…
The night sky is dark
after theastronomer Heinrich Olbers, who wrote a scientific paper on the subject inthe year 1826. As it happens, Olbers was not t…
Olbers’ Paradox,
Step outside on a clear, moonless night, far from city lights, and look upward.You will see a dark sky, with roughly two thousand …
COMPOSITION OF THE ATMOSPHERE
The concentration of the invisible gas water vapor (H 2 O), however, varies greatly from place to place, and from time to time. Cl…
COMPOSITION OF THE ATMOSPHERE
At the surface, there is a balance between destruction (output) and production (input) of these gases. For example, nitrogen is re…
COMPOSITION OF THE ATMOSPHERE
the various gases present in a volume of air near the earths surface. Notice that nitrogen (N 2 ) occupies about 78 percent and ox…
The Earth and Its Atmosphere 1
The earth without an atmosphere would have no lakes or oceans. There would be no sounds, no clouds, no red sunsets. The beautiful …
The Earth and Its Atmosphere
Our atmosphere is a delicate life-giving blanket of air that surrounds the fragile earth. In one way or an-other, it infl uences …
