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Astronomers discover new earth-like planet
The newly discovered planet is relatively near us, about 15 light years from Earth. It is not precisely like our home planet, but a bigger cousin, estimated to be six to eight times Earth's mass, twice the diameter, and so close to its star that it takes less than two days to orbit, making its temperatures oven-like. The star itself is only one-third the mass of our Sun.
The astronomers found it the same way most of the other planets outside our solar system were detected. They did not see it directly, but measured the varying intensity of the starlight, which suggests the star is ________ because a planet's gravity is pulling on it. The new planet caused a much smaller ________ in its star than all the previous planets caused in their stars, leading the astronomers to conclude it is a smaller planet.
U.S. space agency astronomy theorist Jack Lissauer suggests astronomers will find even smaller planets as telescope technology improves to detect less ________ star wobbles. He points out that a U. S. planet-searching satellite to be launched in three years will use another technique that measures momentary decreases in a star's brightness, suggesting that a planet is passing by.
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