Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?
What are the dark blobs (indicated by the red arrows) in thi…
What are the dark blobs (indicated by the red arrows) in this photograph from the Hubble Space Telescope?
Why do orbits of bulge stars bob up and down?
Why do orbits of bulge stars bob up and down?
The overall fusion reaction by which the Sun currently produ…
The overall fusion reaction by which the Sun currently produces energy is
A protogalactic cloud with very little angular momentum is m…
A protogalactic cloud with very little angular momentum is more likely to form an elliptical galaxy than a spiral galaxy.
According to the Hubble Law, a galaxy with a velocity of 25,…
According to the Hubble Law, a galaxy with a velocity of 25,000 km/s will be:
Why is the spectral sequence of stars not alphabetical?
Why is the spectral sequence of stars not alphabetical?
Both photos show the same field of view containing a star-fo…
Both photos show the same field of view containing a star-forming molecular cloud. One of the photos was taken in visible light and the other in infrared light. Which one is the visible-light photo, and how do you know?
The red evolutionary track illustrated in the figure above (…
The red evolutionary track illustrated in the figure above (similar to fig 19.6 in your textbook), that goes from point 4 to 5 to 6 to 7 shows:
Cluster ages can be determined from
Cluster ages can be determined from