Weegy: EDWIN HUBBLE discovered that there were other galaxies besides the Milky Way.
User: Edwin Hubble categorized galaxies according to their
Weegy: Edwin Hubble categorized galaxies according to their VISUAL APPEARANCE.
User: When the Moon reaches equal periods of orbital and rotational periods, it's known as _______ rotation.
Weegy: When the Moon reaches equal periods of orbital and rotational periods, it's known as SYNCHRONOUS rotation.
User: With an average surface temperature of about 737 K, _______ is the hottest planet
Weegy: With an average surface temperature of about 737 K, Venus is the hottest planet.
User: The cloud of interstellar dust and gas that forms a star is known as a
Weegy: The cloud of interstellar dust and gas that forms a star is known as a nebula.
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