By Sunil Kumar

Over 150 years ago, before Neptune was ever sighted in the night sky, French mathematician Urbain Le Verrier predicted the planet’s existence based on small deviations in the motion of Uranus.

Using a laborious computational method to assess the effects of gravity, known as gravitational perturbation theory, lead author Le Verrier argued in favour of Neptune’s existence and predicted the position of this hidden world to within an arc degree, as later detected directly by Johann Galle of the Berlin Observatory. ”Today’s telescopes are detecting planets around distant stars, and NASA’s Kepler Telescope, launched in 2009, is a champion among them,” said Nesvorny.

It finds planets by continuously monitoring the brightness of more than 150,000 stars, searching for brief periods of time, known as transits, when a star appears fainter because it is obscured by a planet passing in the foreground.

Uranus Orbit Invisible Planet Found By Old Technique

Uranus revolves around the Sun once every 84 Earth years. Its average distance from the Sun is roughly 3 billion km (about 20 AU). http://weelookang.blogspot.com/2011/06/ejs-open-source-kepler-3rd-law-system.html (Photo credit: Wikipedia)

 

 

 Invisible Planet Found By Old Technique
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