First proof of water found on planet outside Earth’s solar system

At about 370.3 trillion miles from the Earth, the best evidence to date has been found concerning the existence of water on an extrasolar planet, or a planet circling a star other than our Sun. And, the abundance of water on such planets is key to finding alien life.Astronomers using an infrared camera onboard NASA’s Spitzer Space Telescope have identified clear signs of water on a planet that is 63 light-years (about 370.3 trillion miles) from the Earth. HD 189733b is a planet classified as a gas giant, sometimes also called a Hot Jupiter because of its similarity with the planet Jupiter.Hot Jupiters are also similar to Saturn, Uranus and Neptune, which also reside in our own Solar System. They are a class of extrasolar planets (exoplanets) whose mass is equal to or more than Jupiter.However, Hot Jupiters are normally within 0.05 astronomical units (AU, or about 4.6 million miles) of their parent star, unlike Jupiter, which is about 5 AU (or about 464.8 million miles) from the Sun.