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What is an exoplanet?

What is an exoplanet? April 22, 2021 at 12:07 pm Exoplanets are planets orbiting distant stars beyond our Solar System, and today astronomers calculate that for every star we can see in the night sky, there is on average at least one exoplanet in orbit around it. Advertisement The concept of exoplanets is hardly new: as far back as 1584, Italian philosopher Giordano Bruno suggested space was filled by “an infinity of worlds of the same kind as our own”. An illustration depicting the variety of exoplanets discovered so far. Credit: NASA/JPL-Caltech/Lizbeth B. De La Torre Over the past century, numerous authors, TV directors and film producers set their stories on planets beyond our own Solar System.

Astronomers hopes raised by glimpse of possible new planet

Astronomers hopes raised by glimpse of possible new planet Ian Sample Science editor Astronomers have glimpsed what may be a previously unknown planet circling one of the closest stars to Earth. Researchers spotted the bright dot near Alpha Centauri A, one of a pair of stars that swing around each other so tightly they appear as one in the southern constellation of Centaurus. The stars form what is called a binary system 4.37 light years away, a mere stone’s throw in cosmic terms. So tentative is the sighting that scientists are referring to it only as a “planet candidate”, aware that the bright speck in the darkness of space may be evidence of alien asteroids, streaks of dust, or more prosaically, an unforeseen glitch in their equipment.

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