Exam 12: The Interstellar Medium: Star Formation in the Milky Way

Globular clusters are typically much older than open clusters.

For bright stars to form, the protostars must condense in dense, dark nebulae.

Emission nebulae like M42 occur only near stars that emit large amounts of

Generally, the densest parts of the interstellar medium are the .

Neutral hydrogen clouds appear when viewed visually.

During the T- Tauri phase of a protostar, it

O and B type stars are usually found associated with emission nebulae.

21- cm radio waves are emitted by all molecular hydrogen.

objects are found at opposite ends of the bi- polar jets expelled in the protostar's T- Tauri phase.

Compare and contrast Jupiter and the brown dwarf in the Gliese 229 system.

Interstellar dust clouds are best observed at what wavelength?

In typical globular clusters, the brightest stars are .

What do all the stars in the Orion Association have in common?

Why is infrared much better than visible light in studying star formation?

Why are star clusters ideal sites to study stellar evolution?

Herbig- Haro objects at opposite ends of bipolar jets can span a(n) across.

When an electron in a hydrogen atom changes its spin from the same to the opposite direction as the proton, it

Which of these would typically be the brightest star in a young open cluster?

Where does the 21- cm radiation arise?

Contrast open clusters and associations.