Binary Star
A double star; most commonly, a physical binary, or two stars which revolve about a common center of mass. Binary stars are twins in the sense that they formed together out of the same interstellar cloud.
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Category: Astronomical
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Blue Moon
The second full moon in a calendar month, or the third full moon in a season containing four.
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Category: Astronomical
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Breccia
Coarse-grained rock composed of angular fragments of pre-existing rock.
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Category: Astronomical
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Bedrock
Continuous solid rock that underlies regolith and is exposed at outcrops.
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Category: Astronomical
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Basin
A depressed area with no surface outlet.
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Category: Astronomical
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Basalt
Fine-grained igneous rock (rich in mafic minerals) that has erupted onto the surface.
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Category: Astronomical
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