ExploraTour - How to Build a Star


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The sun is much much bigger than the Earth. It only looks small because it is very far away. It is, without a doubt, the biggest thing you have ever seen up close.

If we took the Sun and put it on one side of a teeter-totter, we would have to fill a huge barrel with 300,000 Earths to raise both sides of the teeter-totter up into the air.

This is very hard to imagine. Think about 300,000 times all the buildings, mountains, people, cars, trains, oceans, rivers and the heavy thick rocks under your feet.

And our sun is not the biggest star either. There are stars much bigger than our sun.



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Our online store includes issues of NESTA's quarterly journal, The Earth Scientist, full of classroom activities on different topics in Earth and space science, ranging from seismology, rocks and minerals, oceanography, and Earth system science to astronomy!

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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