What is the source of the large dust shells seen around some red giants and red supergiants?
A) Leftover material from their formation
B) Debris left behind by a supernova
C) Material from winds from these same stars
D) Debris left behind by passing comets
E) Star-forming molecular clouds
Question 2
Sunspots are dark splotches on the Sun. Which statement is true?
A) They are hotter than the surrounding areas of the Sun.
B) They are extremely cold objects, as cold as Pluto.
C) They are extremely hot, but cooler than the surrounding areas of the Sun.
D) They are solid bodies floating on the surface of the Sun.
E) They are associated with areas of very low magnetic fields.
Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the
Large Octopus
This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S
Booker T. Washington in his office at Tuskegee Institute, 1900. Washington chose a policy of accommo
Large intestine.
The Dust Bowl in North America