Group A Exoplanets And Aliens

An Exoplanet is also called an Extrasolar planet.
An Exoplanet is a planet outside our solar system.

Intresting infomation:
A total of 779 such planets (in 625 planetary systems and 102 multiple planetary systems) have been identified as of June 11, 2012. In a 2012 study, each star of the 100 billion or so in our Milky Way galaxy is estimated to host "on average … at least 1.6 planets."[3][4] Accordingly, at least 160 billion star-bound planets may exist in the Milky Way Galaxy alone.[3][4] Unbound free-floating planetary-mass bodies in the Milky Way may number in the trillions with 100,000 objects larger than Pluto for every main-sequence star.[5]

For centuries, many philosophers and scientists supposed that extrasolar planets existed, but there was no way of knowing how common they were or how similar they might be to the planets of the Solar System. Various detection claims made starting in the nineteenth century were all eventually rejected by astronomers. The first confirmed detection came in 1992, with the discovery of several terrestrial-mass planets orbiting the pulsar PSR B1257+12.[6] The first confirmed detection of an exoplanet orbiting a main-sequence star was made in 1995, when a giant planet was found in a four-day orbit around the nearby star 51 Pegasi. Due to improved observational techniques, the rate of detections has increased rapidly since then.[1] Some exoplanets have been directly imaged by telescopes, but the vast majority have been detected through indirect methods such as radial velocity measurements.

Extraterrestrial life (from the Latin words: extra ["beyond", or "not of"] and‎ terrestris ["of or belonging to Earth"]) is defined as life that does not originate from Earth. Referred to as alien life, or simply aliens (or space aliens, to differentiate from other definitions of alien or aliens) these hypothetical forms of life range from simple bacteria-like organisms to beings far more complex than humans.

The development and testing of hypotheses on extraterrestrial life is known as exobiology or astrobiology; the term astrobiology, however, includes the study of life on Earth viewed in its astronomical context. Many scientists consider extraterrestrial life to be plausible, but little evidence has yet been found

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