Download List of Planets in our Solar System

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Exploring Our Solar System
Science is a dynamic process of questioning, hypothesizing, discovering, and changing
previous ideas based on what is learned. Scientific ideas are developed through reasoning and
tested against observations. Scientists assess and question each other's work in a critical
process called peer review.
Our understanding about the universe and our place in it has changed over time. New
information can cause us to rethink what we know and reevaluate how we classify objects in
order to better understand them. New ideas and perspectives can come from questioning a
theory or seeing where a classification breaks down.
What is a Planet?
Defining the term planet is important, because such definitions reflect our understanding of the
origins, architecture, and evolution of our solar system. Over historical time, objects categorized
as planets have changed. The ancient Greeks counted the Earth's moon and sun as planets
along with Mercury, Venus, Mars, Jupiter, and Saturn. Earth was not considered a planet, but
rather was thought to be the central object around which all the other celestial objects orbited.
The first known model that placed the sun at the center of the known universe with the Earth
revolving around it was presented by Aristarchus of Samos in the third century BCE, but it was
not generally accepted. It wasn't until the 16th century that the idea was revived by Nicolaus
Copernicus. By the 17th century, astronomers (aided by the invention of the telescope) realized
that the sun was the celestial object around which all the planets - including Earth - orbit, and
that the moon is not a planet, but a satellite (moon) of Earth. Uranus was added as a planet in
1781 and Neptune was discovered in 1846.
List of Planets in our Solar System
orbit: 57,910,000 km from Sun
diameter: 4,880 km
mass: 3.30e23 kg
orbit: 108,200,000 km from Sun
diameter: 12,103.6 km
mass: 4.869e24 kg
orbit: 149,600,000 km from Sun
diameter: 12,756.3 km
mass: 5.972e24 kg
orbit: 227,940,000 km from Sun
diameter: 6,794 km
mass: 6.4219e23 kg
orbit: 778,330,000 km from Sun
diameter: 142,984 km
mass: 1.900e27 kg
orbit: 1,429,400,000 km from Sun
diameter: 120,536 km
mass: 5.68e26 kg
orbit: 2,870,990,000 km from Sun
diameter: 51,118 km
mass: 8.683e25 kg
orbit: 4,504,000,000 km from Sun
diameter: 49,532 km
mass: 1.0247e26 kg