A planet is an astronomical object orbiting a star or stellar remnant that
* is massive enough to be rounded by its own gravity,
* is not massive enough to cause thermonuclear fusion, and
* has cleared its neighbouring region of planetesimals.

The term planet is ancient, with ties to history, astrology, science, mythology, and religion. Several planets in the Solar System can be seen with the naked eye. These were regarded by many early cultures as divine, or as emissaries of deities. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate obj

Most Read This Week Tagged "Planets"

Pluto!: Not a Planet? Not a Problem!
Saving Us: A Climate Scientist's Case for Hope and Healing in a Divided World
Zen and the Art of Saving the Planet
Pluto Gets the Call
How to Change Everything: The Young Human's Guide to Protecting the Planet and Each Other
The Girl Who Named Pluto: The Story of Venetia Burney
XO, Exoplanet
Stella's Stellar Hair
If Pluto Was a Pea
A Place for Pluto
The Sun Is Kind of a Big Deal
Red Rover: Curiosity on Mars
Foundation (Foundation, #1)
Foundation's Edge (Foundation, #4)
Forward the Foundation (Foundation: Prequel #2)
Prelude to Foundation
Matter (Culture, #8)
Stranger in a Strange Land
Ringworld (Ringworld, #1)
Shadow of the Giant (The Shadow Series, #4)
Hyperion (Hyperion Cantos, #1)
Pluto Gets the Call
A Place for Pluto
Naked Lunch
A Fire Upon the Deep (Zones of Thought, #1)
Heretics of Dune (Dune, #5)
These Broken Stars by Amie KaufmanAcross the Universe by Beth RevisAlienated by Melissa LandersThe 5th Wave by Rick YanceyThis Shattered World by Amie Kaufman
64 books — 48 voters

The Origin of Continents and Oceans by Alfred WegenerAerial Geology by Mary Caperton MortonSnowball Earth by Gabrielle WalkerEarthquake! by Gloria D. MiklowitzWritten in Stone by Chet Raymo
Plate Tectonics
8 books — 5 voters

The Beast of Cretacea by Todd StrasserSave the Ocean by Bethany StahlSave the Arctic by Bethany StahlThe Ocean at the End of the Lane by Neil GaimanWrong Planet - Searching for your Tribe by Karl Wiggins
Our World - Earth
121 books — 16 voters
Milky Way Tango by Roger Alan BonnerBorn of Night by Sherrilyn KenyonAstraeus by Haley CavanaghHothar's Folly by Gail KogerUnderground Bride by Loretta Johns
Science Fiction Romance Must Reads
23 books — 14 voters

This planet is a broken bone that didn’t set right, a hundred pieces of crystal glued together. We’ve been shattered and reconstructed, told to make an effort every single day to pretend we still function the way we’re supposed to. But it’s a lie, it’s all a lie.
Tahereh Mafi, Unravel Me

Diana Wynne Jones
Mother Very Easily Made Jam Sandwiches Under No Protest
Diana Wynne Jones

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