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2. List of gravitationally rounded objects of the Solar System

   en.wikipedia.org/wiki/List_of_gravitationally...

   According to the IAU's explicit count, there are eight planets in the Solar System; four terrestrial planets (Mercury, Venus, Earth, and Mars) and four giant planets, which can be divided further into two gas giants (Jupiter and Saturn) and two ice giants (Uranus and Neptune). When excluding the Sun, the four giant planets account for more than ...

3. Outline of the Solar System - Wikipedia

   en.wikipedia.org/wiki/Outline_of_the_Solar_System

   The following outline is provided as an overview of and topical guide to the Solar System: Solar System – gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets (including Earth), with the remainder being ...

4. Solar System - Wikipedia

   en.wikipedia.org/wiki/Solar_System

   The outermost region of the Solar System is the theorized Oort cloud, the source for long-period comets, extending to a radius of 2,000–200,000 AU. The closest star to the Solar System, Proxima Centauri, is 4.25 light-years (269,000 AU) away. Both stars belong to the Milky Way galaxy.

5. Geology of solar terrestrial planets - Wikipedia

   en.wikipedia.org/wiki/Geology_of_solar...

   The Solar System is believed to have formed according to the nebular hypothesis, first proposed in 1755 by Immanuel Kant and independently formulated by Pierre-Simon Laplace. [2] This theory holds that 4.6 billion years ago the Solar System formed from the gravitational collapse of a giant molecular cloud. This initial cloud was likely several ...

6. Protoplanetary disk - Wikipedia

   en.wikipedia.org/wiki/Protoplanetary_disk

   This process competes against the stellar wind, which drives the gas out of the system, and gravity and internal stresses , which pulls material into the central T Tauri star. Planetesimals constitute the building blocks of both terrestrial and giant planets. [16] [17]

7. Exoplanet orbital and physical parameters - Wikipedia

   en.wikipedia.org/wiki/Exoplanet_orbital_and...

   For reference, Solar System planets are marked as gray circles. The horizontal axis plots the logarithm of the semi-major axis, and the vertical axis plots the logarithm of the mass. There are exoplanets that are much closer to their parent star than any planet in the Solar System is to the Sun, and there are also exoplanets that are much ...

8. Radar study puts spotlight on Saturn moon Titan's ... - AOL

   www.aol.com/news/radar-study-puts-spotlight...

   NASA's Cassini spacecraft, which explored Saturn and its icy moons, including the majestic Titan, ended its mission with a death plunge into the giant ringed planet in 2017. Cassini's radar ...

9. Hill sphere - Wikipedia

   en.wikipedia.org/wiki/Hill_sphere

   This was thought to explain the preponderance of retrograde moons around Jupiter; however, Saturn has a more even mix of retrograde/prograde moons so the reasons are more complicated. [10] In a two planet system, the mutual hill radius of the two planets must exceed to be stable. Multi-planet systems of three or more with semi-major-axis ...