How did star formation likely proceed in the protogalactic cloud that formed the Milky Way?
A) The stars that formed first could orbit the center of the galaxy in any direction at any inclination.
B) The stars that formed first eventually settled into a galactic disk, circling the center of the galaxy.
C) The protogalactic cloud gradually formed stars, starting from the center of the galaxy working outward.
D) The protogalactic cloud gradually formed stars, starting from the outer edges of the spiral arms and working inward.
A) The stars that formed first could orbit the center of the galaxy in any direction at any inclination.
You might also like to view...
Around 4 billion years ago Venus could have been more Earth-like with liquid water on its surface because
A) Venus has a protective magnetic field B) its atmosphere was thinner C) Venus was farther from the Sun D) the Sun was dimmer so Venus would have received less radiation
Exclusion Principle: How many electrons will fit into a 4f subshell?
A. 3 B. 4 C. 7 D. 14
The atmospheric carbon dioxide concentration
A) is higher than it has been at any time during the last 800,000 years B) is higher than it has been at any time during the Earth's history C) has remained roughly constant during the last 800,000 years D) is lower than it has been at any time during the last 800,000 years
In 2.0 s, a particle moving with constant acceleration along the x axis goes from x = 10 m to x = 50 m. The velocity at the end of this time interval is 10 m/s. What is the acceleration of the particle?
a. +15 m/s2 b. +20 m/s2 c. ?20 m/s2 d. ?10 m/s2 e. ?15 m/s2