A depression on the surface that looks like a channel.
Rille
The International Astronomical Union defined planet on August 24, 2006 and decided that Pluto did not fit the definition.
In 2006 the Astronomical Union defined 'planet' and the definition excluded Pluto. At the same time they created the term dwarf planet into which Pluto fell.
An astronomical unit is the distance from the sun to earth.
1.38
Hadley Rille Books was created in 2005.
Astronomical is an adjective that has a couple meanings. The first meaning of astronomical is relating to astronomy, and the second meaning of astronomical is extremely large.
An astronomical discovery is the discovery of anything outside of the planet earth and its atmosphere.
channel
valley
The fine French surname of Rille is found in the records of Forez, where they had held a family seat.
The International Astronomical Union
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A rille
Rille
false