Io, Jupiter’s fourth largest moon, has over 400 active volcanoes.
http://en.wikipedia.org/wiki/Io_(moon) Source: Wikipedia
While many might assume that Mercury is the hottest planet in our solar system because of its proximity to the Sun, Venus is in fact the hottest planet because of its thick atmosphere of CO2, which traps all of the heat. Mercury, on the other hand, doesn’t have any atmosphere, so all of it’s heat just goes out into space.
http://en.wikipedia.org/wiki/Venus Source: Venus
Jupiter’s icy moon Europa reportedly has an active ocean beneath its surface, which has led scientists to hypothesize that it might be able to support life.
http://en.wikipedia.org/wiki/Europa_(moon) Source: Wikipedia
There are four planets in our solar system with rings – Jupiter, Saturn, Uranus and Neptune – which are all gas giants. Jupiter’s rings are faint while Saturn’s are the brightest. Uranus’ rings are hard to see and Neptune’s are also really faint.
http://imgkid.com/neptune-planet-rings.shtml Source: imgkid.com
Titan, one of Saturn’s many moons, has lakes, rivers and oceans of liquid, ethane, methane and propane.
http://www.huffingtonpost.com/2013/10/27/lakes-saturn-moon-titan-photos_n_4167754.html Source: Huffington Post
Our solar system has five dwarf planets – Ceres, Pluto, Eris, Makemake and Haumea. Scientists believe that there may be dozens or possibly even 100 more dwarf planets in our solar system awaiting discovery.
http://www.8planets.co.uk/facts-about-haumea Source: www.8planets.co.uk