1.
The Bohr Model
This similarity between a planetary model and the Bohr Model of the atom ultimately arises because the attractive gravitational force in a solar system and ...
2.
A Mystery: Gamma Ray Bursts
These Gamma Ray Bursts pose one of the greatest mysteries of modern astronomy. First discovered by military satellites looking for the telltale signature of ...
3.
The Earth's Atmosphere
The atmosphere of the Earth may be divided into several distinct layers, ... Above the troposphere is the stratosphere, where air flow is mostly horizontal. ...
4.
Celestial Coordinate System
In the diagram showing the position of Sirius in the sky the view is instead the actual sky as viewed from the Earth (that is, from the center of the sphere ...
5.
Orbit and Phases of the Moon
Because of this tidal locking of the periods for revolution and rotation, the Moon always keeps essentially the same face turned toward the Earth (small ...
6.
The Earth's Atmosphere
Describes the composition and layers of the atmosphere.
7.
The Earth's Atmosphere
... solar nebula and close to the present composition of the Gas Giant planets, ... The atmosphere of the Earth may be divided into several distinct layers, ...
8.
The Seasons
The primary cause of the seasons is the 23.5 degree of the Earth's rotation axis with respect to the plane of the ecliptic, as illustrated in the adjacent ...
9.
Celestial Coordinate System
It is useful to impose on the celestial sphere a coordinate system that is analogous to the latitude-longitude system employed for the surface of the Earth. ...
10.
The Universe of Aristotle and Ptolemy
The Earth is at the center of the Universe. These ideas concerning uniform circular motion and epicycles were catalogued by Ptolemy in 150 A.D. His book was ...
