Shop Windows to the Universe

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.

Exploratour - Evolution of the Solar System

Click on image for full size

This page marks the beginning of section 2 of the tour, but it also marks the end of the tour for now. Come back later for more on the continuing evolution of the solar system.

We've discussed the collapse of the solar nebula, planetismals sweeping up material, including the possibility of comets bringing volatiles into the inner solar system, the differentiation of the terrestrial planets, and we've discussed the T-Tauri phase of the Sun. Once the T-Tauri phase was complete, and the solar system was swept clean of material left over from the solar nebula, the planets can be considered to be officially "born". Now the Earths geologic "clock" starts to run. The first age of the Earth's history is called the Archean age. The Archean age started at this time.

Earth's surface was very hot and was still cooling. This means that there was no ocean on the Earth. We don't know for sure, but the rocks were probably all igneous rocks because they came out of volcanoes. Whatever the atmosphere there was prior to this time, at this point in history, the atmosphere of Earth began to change.

This is page 28 of 60

Shop Windows to the Universe Science Store!

Our online store includes books on science education, ranging from evolution, classroom research, and the need for science and math literacy!

You might also be interested in:

Traveling Nitrogen Classroom Activity Kit

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

Exploratour - Evolution of the Solar System

This tour is not ready yet, but you can click through and look at the pictures if you wish! Please come back in 30 days. This page is the start of the tour of the Evolution of the Solar System. The navigation...more

ExploraTour - Looking at the World in a Different Light

Even though the sleeping man is no longer on the bed, you can still see where he was lying down. The heat from his body warmed up the bed sheets which are now radiating infrared light toward your eyes....more

ExploraTour - Looking at the World in a Different Light

All warm objects radiate in the infrared. The warmer the object, the higher the frequency and intensity of the radiation. Very hot objects give off other types of radiation in addition to infrared. Click...more

ExploraTour - Looking at the World in a Different Light

Your eye is a wonderful detector of visible light. Different frequencies of light produce different sensations in the eye which we interpret as colors. Our eyes detect light by using light sensitive components...more

ExploraTour - Looking at the World in a Different Light

Imagine you found a pair of special glasses that not only gave you telescopic vision but gave you the ability to see all forms of radiant energy. The universe in visible light contains all the familiar...more

ExploraTour - Looking at the World in a Different Light

This is a volcano on the island of Miyake in Japan. It has erupted, sending hot lava and ash into the air, a total of ten times. The time after one eruption until the next occurred was about twenty years...more

ExploraTour - Looking at the World in a Different Light

The awesome power of a giant black hole was revealed by looking at this galaxy in three different types of light. The picture that you see is of Centaurus A, a very peculiar galaxy. A galaxy is just a...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA