Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column.
1. The Sun formed, probably along with other stars, within a large .
2. A consists of two stars that orbit each other every few days.
3. A is a "star" so small in mass that its core never gets hot enough to sustain nuclear fusion reactions.
4. Most of the gas remaining from the process of star formation is swept into interstellar space by a .
5. As a protostar's internal temperature increases, its growing helps slow its contraction due to gravity.
6. Planets may form within the that surrounds a forming star.
7. Mass can be lost through a of material ejected along a protostar's axis of rotation.
8. A "star" with mass below 0.08 solar mass has its gravitational contraction halted by .
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