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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.

Make Your Own Alien!

One of the most commonly asked questions our scientists receive regards the existence of life elsewhere in our universe. Use this applet to construct your own E.T., or follow the links below to learn more!

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Do you think there might be life on other planets?
Are current space missions bringing any answer to the possibility of life on other planets?
What is the formula that breaks down the possibility of life on other planets?
If there was intelligent life on other planets, would it look like us or something weird?
What lifeform could live on Jupiter or Mars?
Real Aliens Don't Look Like E.T.
Quickie Questions - Alive and Living - Extraterrestrials
What is Life?
Adlib Story: Abducted by Aliens!

Shop Windows to the Universe Science Store!

Learn about Earth and space science, and have fun while doing it! The games section of our online store includes a climate change card game and the Traveling Nitrogen game!

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Real Aliens Don't Look Like E.T.

Twenty years after the making, E.T. the extraterrestrial is still entertaining the world. Portrayed as a lovable, happy friend, E.T. stole the hearts of millions over the years. However, to this day scientists...more

Aldebaran - Orange Giant Star

What's in a Name: Arabic for "Follower" because it rises after the Pleiades. The Pleiades is a group of 6 stars traveling together through space. The eye of the constellation Taurus, the bull. Claim to...more

Alpha Centauri - The Sun's Twin

What's in a Name: Sometimes called Rigel Kentaurus meaning "foot of the Centaur" in Arabic. Claim to Fame: Member of the triple star system closest to our sun. 3rd brightest star in the sky (apparent...more

ExploraTour - Looking at the World in a Different Light

Did you ever wonder what it would be like to see things in the world that are beyond the limits of your normal vision ... like x-rays or heat radiation. You would have a lot more information about the...more

ExploraTour - Looking at the World in a Different Light

To find the cause of radiant energy we have to look deep into the heart of matter. Even though matter appears solid, it's really composed of tiny particles called atoms. If you could shrink down smaller...more

ExploraTour - Looking at the World in a Different Light

Protons are positively charged, electrons are negatively charged and neutrons have no charge. As you look down at the nucleus, you see that there are the same number of protons below you as there are...more

ExploraTour - Looking at the World in a Different Light

Radiant energy, called "electromagnetic radiation", is released every time an electron slows down, changes its orbit around an atom or vibrates back and forth. Through these changes in its motion, the...more

ExploraTour - Looking at the World in a Different Light

Visible light is only a small portion of the sea of radiant energy that bathes the Earth. The rest is invisible and can be measured using electronic devices or photographic films. All forms of radiant...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