[DOC] [TLE] Planetary Motion: The History of an Idea That Launched the ... [PAR] While Copernicus rightly observed that the planets revolve around the Sun, it was 
Kepler ... (rayed disk) orbiting the Earth (black dot), but the other planets (symbols
) orbiting the Sun. ... This discovery (which became Kepler's second law of orbital 
motion) led to the ... Objects far from the Sun won't be influenced by its gravity. [DOC] [TLE] Discovery of Neptune - Wikipedia [PAR] The planet Neptune was mathematically predicted before it was directly observed
. With a ... By 1847 the planet Uranus had completed nearly one full orbit since its 
... The discovery of Neptune led to the discovery of its moon Triton by William ... 
and its apparent size too small, to clearly appear to be a planet in Galileo's small
... [DOC] [TLE] Planets beyond Neptune - Wikipedia [PAR] Following the discovery of the planet Neptune in 1846, there was considerable 
speculation that ... In 1978, Pluto was conclusively determined to be too small for 
its gravity to affect the giant planets, resulting in a brief search for a ... These were 
taken to indicate the existence of yet another planet orbiting beyond Neptune. [DOC] [TLE] Extrasolar Planets [PAR] Not only are they really far away, but planets are really dim compared to their 
parent ... other, both the large child and the small child orbit a common center of 
mass. ... Most planets discovered around other stars have been very massive and 
orbit ... a glitch in our theory of formation, but it doesn't necessarily mean it's 
wrong. [DOC] [TLE] Scientists Find Evidence for Ninth Planet in Solar System [PAR] Jan 20, 2016 ... It's tantalizing evidence that a ninth large planet might live in the ... If there's 
going to be another planet in the solar system, I think this is it, ... And it's really far 
away. ... sculpting their peculiar orbits, as well as those of a handful of other ... But 
Pluto was too small to explain what Lowell believed were telltale... [DOC] [TLE] Could There Be Another Planet Behind the Sun? - Universe Today [PAR] As the Earth orbits the Sun, it's subtly influenced by those other planets, .... For 
years NASA was forced to keep their discovery a secret from the public. ..... I've 
heard of a Planet X theory; that there is a large Jupiter-sized planet on an .... If 
a small enough object can exist in orbit around the sun at L3, how large can this... [DOC] [TLE] Two planets beyond Pluto? | Science Wire | EarthSky [PAR] Jan 15, 2015 ... Since Clyde Tombaugh discovered Pluto in 1930, astronomers ... Plus, according 
to the theory, their orbits must be inclined to the ... an influence on the orbit of 
another body that is smaller and farther away object. ... It's a good question. ... to 
consider other celestial bodies like Ceres and Eris planets too. [DOC] [TLE] The Incredible Design of the Earth and Our Solar System [PAR] The unique arrangement of large and small planetary bodies in the solar system 
... one of the most stable orbits among all the planets discovered to date, its 
periodic ... The best explanation (other than outright miracle) for the moon's 
existence is .... small), exact rotational characteristics (long rotational periods will 
lead to too... [DOC] [TLE] Caltech Researchers Find Evidence of a Real Ninth Planet | Caltech [PAR] Jan 20, 2016 ... The six most distant known objects in the solar system with orbits exclusively ... 
The researchers, Konstantin Batygin and Mike Brown, discovered the .... learn 
more about the planet's orbit and its influence on the distant solar system. ... 
would actually make our solar system more similar to the other planetary... [DOC] [TLE] Astronomers say a Neptune-sized planet lurks beyond Pluto - Science [PAR] Jan 20, 2016 ... Planet would orbit the sun once every 15000 years. ... Its closest approach to the 
sun is seven times farther than Neptune, ... But Brown knows that no one will 
really believe in the discovery until Planet X itself appears within a ... In 1930,

Question: It's actually too small to influence other planets' orbits, the theory that led to its discovery
Answer: Pluto