Shop Windows to the Universe

The Spring 2011 issue of The Earth Scientist is focused on modernizing seismology education. Thanks to IRIS, you can download this issue for free as a pdf. Print copies are available in our online store.
Solar eclipse image taken aboard Gemini 12.
Click on image for full size
Courtesy of NASA

Can an Eclipse Change Gravity? (Updated!)
News story originally written on September 20, 1999

For over 40 years, scientists have wondered if a solar eclipse can change Earth's gravity. A scientist named Maurice Allais thinks that during an eclipse, Earth's gravity is greater.

Allais used a Foucault pendulum to test his theory. This special pendulum swings in the same direction, even though the Earth turns below it. Scientists tested the theory during the last solar eclipse of the millennium. Not all of the data has been studied, but some scientists say they saw a change in the pendulum's swing during the eclipse.

It will take months before the results will be out. The pendulums were video taped during the event. Once they are analyzed, the scientists in charge of the experiment will reveal the results.

Shop Windows to the Universe Science Store!

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!

Windows to the Universe Community

News

Opportunities

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

Solar Eclipses

An eclipse of the Sun occurs when the Earth passes through the moon's shadow. A total eclipse of the Sun takes place when the Moon is directly between the Sun and the Earth. When a total eclipse does...more

1999--A Year in Review...

It was another exciting and frustrating year for the space science program. It seemed that every step forward led to one backwards. Either way, NASA led the way to a great century of discovery. Unfortunately,...more

STS-95 Launch: "Let the wings of Discovery lift us on to the future."

The Space Shuttle Discovery lifted off from Kennedy Space Center on October 29th at 2:19 p.m. EST. The sky was clear and the weather was great. This was the America's 123rd manned space mission. A huge...more

Moon Found Orbiting Asteroid

Scientists found a satellite orbiting the asteroid, Eugenia. This is the second one ever! A special telescope allows scientists to look through Earth's atmosphere. The first satellite found was Dactyl....more

U.S. is Fed Up with Russia

The United States wants Russia to put the service module in orbit! The module is part of the International Space Station. It was supposed to be in space over 2 years ago. Russia just sent supplies to the...more

More on Recent Coronal Mass Ejection

A coronal mass ejection (CME) happened on the Sun last month. The material that was thrown out from this explosion passed the ACE spacecraft. ACE measured some exciting things as the CME material passed...more

Mother Nature's Air Conditioning

Trees and plants are a very important part of this Earth. Trees and plants are nature's air conditioning because they help keep our Earth cool. On a summer day, walking bare-foot on the sidewalk burns,...more

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