What do we mean by a protogalactic cloud?
A. a cloud of hydrogen and helium that contracts to become a galaxy
B. a term once used historically to refer to any galaxy
C. the cloud-like halo that surrounds the disks of spiral galaxies
D. a cloud of gas that was once a galaxy
Answer:A
What do we mean by a protogalactic cloud?
A. a cloud of hydrogen and helium that contracts to become a galaxy B. a term once used historically to refer to any galaxy C. the cloud-like halo that surrounds the disks of spiral galaxies D. a cloud of gas that was once a galaxy