Changing minds: From the time the idea of dark matter was first proposed in the 1930s, it took nearly 50 years for astronomers to universally accept the existence of dark matter. Discuss the process by which that acceptance came about.
What evidence was collected, and how was it checked?
Question 2
Order the interior layers of the Sun from the hottest to the coldest.
A) radiation zone, core, convection zone, photosphere
B) photosphere, convection zone, core, radiation zone
C) core, radiation zone, convection zone, photosphere
D) photosphere, convection zone, radiation zone, core