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Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD 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 Fall 2009 issue of The Earth Scientist, which includes articles on student research into building design for earthquakes and a classroom lab on the composition of the Earth’s ancient atmosphere, is available in our online store.

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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

When we talk about the movement of a planet, we talk about its rotation (spinning around its internal axis) and revolution (revolving around the Sun). Axis tilt occurs when a planet rotates around an axis...more

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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