EarthSky | Meet the Pi planet. It orbits its star every 3.14 days
TESS discovers its third new planet, with longest orbit yet | MIT News | Massachusetts Institute of Technology
Astronomers Have Found Another Possible 'Exomoon' beyond Our Solar System - Scientific American
For life to form on a planet it needs to orbit the right kind of star
We've found an exo-planet with an extraordinarily eccentric orbit
New Clue to “Planet Nine” – Hubble Pins Down Weird Exoplanet With Far-Flung Orbit
Is a planet's orbital period related to the planet's size? | Socratic
Martian moon's orbit suggests the Red Planet had a ring | Space
Planet Orbits - Space Facts
ViewSpace | Exoplanet Diversity: Orbital Distance
Artist's concept of nearest extrasolar planet to our Solar System | ESA/Hubble
Mars - Basic astronomical data | Britannica
ESO
New-Found Dwarf Planet Points to Solar System's Chaotic Past - Eos
Newfound Alien Planet Has a Bizarre Looping Orbit - Scientific American
Saturn overtakes Jupiter as planet with most moons - BBC News
Planet 9 location, orbit, distance, name, and black hole theory for the mysterious object
What Would it Be Like if Earth Changed its Orbit? » Science ABC
New discovery: small planets have circular orbits
File:Planet Nine Orbit.svg - Wikimedia Commons
The planets that orbit a backward-spinning star
