New stars are most likely to form in
a. the central bulge of the galaxy, where star density is higher.
b. small, individual clouds of cold, dense gas and dust collapsing to form single stars or binaries.
c. regions of ionized hydrogen near young, massive O and B stars (H II regions).
d. immense clouds of cold, dense gas and dust up to 300 light-years across.
d. immense clouds of cold, dense gas and dust up to 300 light-years across.
With the low temperature, the atoms and molecules are moving slowly enough that gravity can pull them together and cause them to collapse into stars.
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Uncertainty Principle Using Energy and Time: The energy released when an unstable electron state decays has an uncertainty of about 0.50 eV. What is the uncertainty in the life-time of the level? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 1.3 × 10-15 s B. 8.3 × 10-15 s C. 1.3 × 10-11 s D. 8.3 × 10-11 s
Our theories of galaxy formation are just as well developed and tested as are our theories of star and planet formation
Indicate whether the statement is true or false
The ideal shape for the primary mirror of a telescope is concave parabolic
Indicate whether the statement is true or false
The ____________________ of the Sun is composed of ionized gas and produces a continuous spectrum with a superimposed emission spectrum
Fill in the blank(s) with correct word