What are exoplanets?


NASA is holding a news conference on Wednesday at 11.30 p.m. IST on new findings on exoplanets. Prominent NASA scientists, astronomers and a professor of planetary science and physics at Massachusetts Institute of Technology will participate at the briefing. Details of these findings will also be published in the journal Nature on the same day NASA hosts the briefing.

Here’s a primer on the history of exoplanet discoveries:
What are exoplanets?

Exoplanets are planets that orbit stars other than our sun.
When was the first exoplanet discovered?

The first exoplanet, 51 Pegasi b, was discovered in 1995 by Michael Mayor and Didier Queloz.
How many exoplanets have been identified till now?

According to NASA there are 3449 confirmed exoplanets from among 4,669 candidates in 2,577 solar systems. Among the confirmed ones there are 1,264 Ice Giants (a giant planet composed mainly of elements such as oxygen, carbon, nitrogen, and sulfur), 1,043 Gas Giants (planets mostly composed of gases such as hydrogen and helium), 781 Super-earths (planets larger than Earth, but smaller than Uranus or Neptune), 348 terrestrial exoplanets (aka rocky planets, they are composed of silicate rocks or metals) and 13 are yet to be classified.
Which is the latest entrant into the exoplanet league?

KELT-16 b. A Gas Giant, the KELT-16b, according to NASA, is at least 2.74 times bigger than Jupiter, the biggest planet in our solar system.
Do these exoplanets support life?

The search for exoplanets is also the search for alien life and habitable spaces beyond our star system. NASA’s Kepler and K2 missions have identified several such candidates. To be considered habitable, exoplanets must orbit within a distance of their stars in which liquid water can exist on the planet’s surface, receiving about as much sunlight as Earth. This distance is called the “Goldilocks” zone.

Sources: NASA, Wikipedia

Source: xaam.in

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