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Dig into Montana Before History: 11K Years of Hunter-Gatherers in the Rockies and Plains by D. H. MacDonald, Ph.D. See our online store book collection.

Solar System Reference Data

Table of asteroids

Table of comets

Table of moons

Table of planets and dwarf planets

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune (individual planet statistics pages...)

Pluto, Makemake, Ceres, Eris (individual dwarf planet statistics pages...)

Table of orbital data for planets and dwarf planets

Last modified July 23, 2008 by Randy Russell.

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The Summer 2010 issue of The Earth Scientist, available in our online store, includes articles on rivers and snow, classroom planetariums, satellites and oceanography, hands-on astronomy, and global warming.

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Science, Evolution, and Creationism

How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more

Axis Tilt

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Rotational Period

Rotational period is the term describing the length of time necessary for a space object to make one complete rotation. This time varies from planet to planet, and on Earth it is 1 day. This length of...more

Asteroids

Asteroids are small bodies that are believed to be left over from the beginning of the solar system 4.6 billion years ago. They are rocky objects with round or irregular shapes up to several hundred km...more

Early Cratering of the Planets

When we look at images of many of the planets, we see all sorts of circular craters on the planet surfaces. Most of these craters were probably formed when the solar system was still very young. Once...more

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