According to NASA, more than 1,700 planets have been confirmed outside of our own solar system. However, the number of planets in the universe could essentially be infinite because scientists have yet to find the so call... More »

Scientists estimate that 100 to 400 billion planets exist in the Milky Way galaxy. Some studies suggest that the number of planets in the Milky Way is greater than the number of stars, proposing that an average of 1.6 pl... More »

As of 2015, the largest known planet in the universe is TrES-4, a gas giant that is approximately 1.7 times the diameter of Jupiter, but only approximately 92 percent as massive. Located 1,430 light-years from Earth, TrE... More »

www.reference.com Science Astronomy Planets

Heavenly bodies are the things that make up the universe, such as stars, planets and smaller objects. Within these categories are many different variations instead of one single type. More »

In the universe, an asteroid belt physically separates and distinguishes the inner planets from the outer planets. This asteroid belt appears just after Mars and right before Jupiter. Mars bears the distinction of farthe... More »

The planets, with the exception of dwarf planet Pluto, lie in the same relatively flat plane because the solar system formed from a collapsing disk of spinning material 4.5 billion years ago. A cloud of material condense... More »

Saturn is the fifth-brightest item in the solar system, and unlike most other planets, it is visible to the naked eye. Whereas it takes one year for Earth to complete an orbit around the sun, Saturn moves much more slowl... More »