To be declared a planet, an object must meet three criteria. The planet must orbit the sun, and it must be almost completely round ? a condition that astronomers call maintaining hydrostatic equilibrium. Finally, you may want to contemplate the role of Pluto while exercising on these planet yoga mats because it could not meet the last condition of clearing its neighborhood of all other objects that it does not have a gravitational pull on.
To be declared a planet, an object must meet three criteria. The planet must orbit the sun, and it must be almost completely round ? a condition that astronomers call maintaining hydrostatic equilibrium. Finally, you may want to contemplate the role of Pluto while exercising on these planet yoga mats because it could not meet the last condition of clearing its neighborhood of all other objects that it does not have a gravitational pull on.
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