1. The estimated rate at which supernova explosions occur in our Galaxy is Selec

ID: 232180 • Letter: 1

Question

The estimated rate at which supernova explosions occur in our Galaxy is

Select one:

a. about once every 5 years.

b. about once every 5000 years.

d. about once every 50 years.

The most recent supernova explosion in our Galaxy seen from Earth was observed in 1604. Why have we not seen any more recent supernovae?

Select one:

a. Since the invention of the electric light bulb, our ability to observe the sky has greatly decreased.

b. Most supernovae produce X rays and radio waves, not visible light, and were hence invisible to earlier observers.

d. Most supernovae occur in the galactic plane, where interstellar dust will have hidden them from our view from the Earth.

1. d.about once every 50 years

2. d. Most supernovae occur in the galactic plane, where interstellar dust will have hidden them from our view from the Earth.

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.