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Rating: 4.50
Aurora borealis
Aurora is a luminous glow of the upper atmosphere which is caused by energetic particles that enter the atmosphere from above. This definition differentiates aurora from other forms of airglow, and from sky brightness that is due to reflected or scattered sunlight. Airglow features that have &qu...
Posted by: Kimberly Terry on Monday, 02 Nov 2009   Views: 137
Rating: 3.00
Solar Eclipse
The Moon cycles through its phases during its 29.5-day orbit around Earth. While the Sun always illuminates half of the Moon, the apparent shape of the Moon as seen from Earth depends on Earth's relative position. For example, at full moon, the Moon appears as a full disk because Earth is between...
Posted by: Kimberly Terry on Monday, 02 Nov 2009   Views: 125
Rating: 0
Comets
The Moon cycles through its phases during its 29.5-day orbit around Earth. While the Sun always illuminates half of the Moon, the apparent shape of the Moon as seen from Earth depends on Earth's relative position. For example, at full moon, the Moon appears as a full disk because Earth is between...
Posted by: Kimberly Terry on Tuesday, 21 Jul 2009   Views: 99