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Other Worlds, Other Stars

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We used to be able to count the number of known planets on the fingers of both hands. Then astronomers developed ways to find worlds around other stars. We are discovering new ones all the time, as shown on the counter above. Our solar system isn’ t alone in the galaxy anymore.

We haven’t found a planetary system that exactly matches our Sun’s collection of planets, moons, asteroids, and comets. The first extrasolar worlds we discovered are the size of Jupiter. The search continues for even smaller, more Earthlike planets orbiting other stars.

button47 Ursae Majoris
button51 Pegasi b
button55 Cancri A
buttonGamma Cephei A
buttonGliese 876
buttonPSR 1257+12
buttonUpsilon Andromedae A