Gamma-rays.

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Question 1 Protostars can be directly observed
in
Review Quiz No. 15

1. Gamma-rays.
2. X-rays.
3. Ultraviolet light.
4. Visible light.
5. Infrared light.

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Question 2The youngest star clusters are also
known as

1. Globular clusters.
2. Galaxy clusters.
3. O/B associations.
4. Blue clusters.
5. K-12 clusters.

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Question 3What are Herbig-Haro Objects?

1. A special type of open star clusters with very
   young stars.
2. Galaxies with very active star formation.
3. Protostellar disk with bipolar outflows (jets).
4. Dense pockets of gas which might very soon
   contract to form stars.
5. Very massive stars that can trigger further star
   formation.

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Question 4What are Bok Globules?

1. A special type of open star clusters with very
   young stars.
2. Galaxies with very active star formation.
3. Protostellar disk with bipolar outflows (jets).
4. Dense pockets of gas which might very soon
   contract to form stars.
5. Very massive stars that can trigger further star
   formation.

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