New discovery: small planets have circular orbits
Hubble Pins Down Weird Exoplanet with Far-Flung Orbit – Exoplanet Exploration: Planets Beyond our Solar System
Astronomers Discover Planet with Largest Orbit Ever | Sci-News.com
New-Found Dwarf Planet Points to Solar System's Chaotic Past - Eos
Solar system planets, order and formation: A guide | Space
The planets that orbit a backward-spinning star
Newfound Alien Planet Has a Bizarre Looping Orbit - Scientific American
EarthSky | Meet the Pi planet. It orbits its star every 3.14 days
Solar System - Wikipedia
File:Planet Nine Orbit.svg - Wikimedia Commons
The Orbit of the Planets. How Long Is A Year On The Other Planets? - Universe Today
Planet Orbits - Space Facts
orbit | astronomy | Britannica
A Super-Earth May Orbit Proxima Centauri, the Closest Star to the Sun
Kepler-90 Planets Orbit Close to Their Star | NASA
ViewSpace | Exoplanet Diversity: Orbital Distance
We've found an exo-planet with an extraordinarily eccentric orbit
What Would it Be Like if Earth Changed its Orbit? » Science ABC
Artist's concept of nearest extrasolar planet to our Solar System | ESA/Hubble
A New World's Extraordinary Orbit Points to Planet Nine | WIRED
New Clue to “Planet Nine” – Hubble Pins Down Weird Exoplanet With Far-Flung Orbit
New Study Knocks Theory of Planet Nine's Existence Out of Orbit | Smart News| Smithsonian Magazine
Claim for giant 'Planet Nine' at Solar System's edge takes a hit | Science | AAAS
Planet 9 location, orbit, distance, name, and black hole theory for the mysterious object
TESS discovers its third new planet, with longest orbit yet | MIT News | Massachusetts Institute of Technology
An 8th Planet Is Found Orbiting a Distant Star, With A.I.'s Help - The New York Times
This weird 'whiplash' planet is unlike anything astronomers have ever seen
