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Dwarf planet
A solar-system object that orbits the Sun and is nearly round due to its own gravity, but has not cleared the neighborhood around its orbit.
Exoplanet
An exoplanet is a planet that orbits a star outside the Solar System.
Lunar eclipse
A lunar eclipse occurs when the Earth is between the Sun and the Moon.
Orbit
An orbit is a circular or elliptical path followed by an object as it moves around another object in space.
Planet (IAU definition)
An object that orbits the Sun, is massive enough to be nearly round due to its own gravity, has cleared the neighborhood around its orbit, and is not massive enough to sustain nuclear fusion.
Satellite
A natural object that orbits a larger body due to gravity, such as the Moon orbiting Earth.