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At 30 times the width of a sperm, the egg is massive enough to be seen with the naked eye.
Stars are giant, usually symmetrical balls of radiant gas, while the definition of both a planet like Jupiter and a plutoid like Pluto is a celestial object orbiting a star that is itself massive enough to be largely round.
Dwarf planets must orbit the sun and be massive enough to be shaped by their gravity, but, unlike proper planets, have not cleared a path through the solar system.
The object must be massive enough to be a sphere by its own gravitational force.
Unfortunately tidal interactions between a hypothetical moon, the planet, and the star could destroy moons massive enough to be habitable over the lifetime of the system.
Triton is the largest Neptunian moon, comprising more than 99.5% of the mass in orbit around Neptune, and it is the only one massive enough to be spheroidal.
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Today, after a 2006 ruling by the International Astronomical Union, they are officially designated "dwarf planets" if, like Ceres, they are massive enough to have been rounded to spheres by their own gravity.
Such explosions, the death rattles of massive stars, are powerful enough to be seen clear across the universe when the universe was younger and, presumably, expanding faster.
True, the Island group never quite managed to crack the US market, but to their UK fans, the trio's massive string of hits was quite enough to be getting on with, thank you very much.
By measuring Doppler shifts of the two gaseous disks as they orbit each other every 60.37 days, the scientists deduce that the dark object weighs 3.8 to 6.9 times more than the sun massive enough to be a black hole, the researchers report online today in Nature.
Nineteen moons are known to be massive enough to have relaxed into a rounded shape under their own gravity, and seven of them are more massive than either Eris or Pluto.
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CEO of Professional Science Editing for Scientists @ prosciediting.com