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Hands On Mineral Identification helps you to identify over 14,500 minerals! By M. Darby Dyar, Ph.D. See our DVD collection.
This photo was taken in December 1972 by the Apollo 17 crew. The spacecraft was traveling between the Earth and the Moon. The reddish landmass is Africa and Saudi Arabia which is desert. The white is both clouds and the ice covering Antarctica.
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Image courtesy of NASA/JPL

Earth--What a Drag!?!
News story originally written on April 1, 1998

Have you ever played with 3D glasses? According to Albert Einstein, there should be 4D glasses -- these glasses would see what is called space-time. Space-time has 4 dimensions (north-south, east-west, up-down and time).

Scientists have just found that the Earth drags space-time around itself as it rotates! You can think of the Earth like a bowling ball. Now if you put the ball in syrup and spun it around, the ball would spin the syrup around itself. The syrup in this example is like space-time.

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Our online store includes fun classroom activities for you and your students. Issues of NESTA's quarterly journal, The Earth Scientist are also full of classroom activities on different topics in Earth and space science!

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF