Exoplanets, also known as extrasolar, are unique planets that are not part of our solar system. In fact, around 1,800 of these planets have been discovered since 1992, when the first exoplanet was discovered. However, the first exoplanet discovered orbiting a star was called 51 Pegasi B and was founded in 1995. There are many types of exoplanets that vary greatly. Some examples of these exoplanets are gas giants, pulsar planets, hot Jupiter and many others. Exoplanets are difficult to find, but there are different methods that can be used to find them. Some of these methods are Doppler spectroscopy, telescopes, and observation of parent stars. Exoplanets give us hope that there might be a planet in the Universe similar to Earth and capable of supporting life. Exoplanets are unique and there is still a lot we don't know about them. Exoplanets have been around for a long time, but we only started discovering them in 1992. This exoplanet orbited a pulsar. A few years later, in 1995, we discovered the first exoplanet orbiting a star like our sun. This exoplanet was called 51 Pegasi B. 51 Pegasi B is a hot Jupiter that can reach 1,000 degrees Celsius. News of exoplanets spread and the discovery of these mysterious planets increased. There are many types of exoplanets, ranging from size to surface composition. Some examples of these exoplanets are gas giants, hot Jupiters, exo-Earths, free-floating planets and super-Earths. Gas giants, the most common type of exoplanet, are similar to Saturn and Jupiter in that their surfaces are made of hydrogen and helium. Not only is there a surface similar to Sat... middle of paper ...... uh by finding all these exoplanets, scientists can't confirm that they are true habitable planets. Scientists estimate that 10 to 20 percent of stars in the universe contain a planet. One of the problems with finding a planet where life lives is that if a planet were identical to Earth, it would be almost impossible to find it because it would be very small. Scientists keep trying and know that sooner or later they will discover a habitable planet. Exoplanets, also known as extrasolar, are very unique and keep us curious. Scientists and astronomers know very little about exoplanets and there is much to discover. An example of this is if there are other planets that support life or if Earth is unique and the only planet that can be habitable. In conclusion, there will always be other exoplanets to discover in the Universe..