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We now offer the Cool It! card game in our Science Store. Cool It! is the new card game from UCS that teaches kids about the choices we have when it comes to climate change.
Tau1 Gruis, the star that the newly discovered exoplanet orbits around.
Courtesy of NASA/JPL

More than 100 planets orbit distant stars!
News story originally written on September 25, 2002

Astronomers have identified another exoplanet, that is, a planet outside our solar system. This makes a total of 102 exoplanets that have so far been found by astronomers!

The astronomers that identified this exoplanet, have been searching outside our solar system for planets that are similar to Earth. The planet they found is circling the star Tau1 Gruis and is three times as far from its star as Earth is from the Sun. The newly discovered planet has a mass similar to that of Jupiter. The solar system of this newly discovered planet is organized a bit like ours, with the planets strung out in a line from the star and the larger ones further away.

How do astronomers find exoplanets? They look for stars that appear to wobble because of the gravitational pull of orbiting planets. The wobble can be detected by a Doppler shift in the starís light indicating the presence of a planet. This is then fine tuned to assess the planetís distance from the star and mass.

After astronomers have a good idea which of the exoplanets are like Earth, their next step is to look for evidence of life by analyzing the chemistry of the planet and its atmosphere, searching for carbon, carbon dioxide, and ozone. Perhaps they will someday find evidence that we are not alone in the universe!


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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