How often does Venus rotate on its axis? a. 24 h b. 182 Earth ...

[crazycityslicker]

How often does Venus rotate on its axis?
 
  a. 24 h
 b. 182 Earth days
  c. 243 Earth days
  d. 1 Earth year
 e. 3 Earth years

Question 2

Describe the process that causes a massive star to become a supernova.
 
  What will be an ideal response?

[joshraies]

Answer to Question 1

c

Answer to Question 2

A massive star will follow the same steps of hydrogen core burning, hydrogen shell burning, helium core burning and helium shell burning that a medium mass star will. A massive star will build up carbon in its core, and eventually reach a temperature where the carbon will fuse. The carbon will produce neon and oxygen as a byproduct. Eventually the core temperature will reach a point where these elements can fuse. This process continues until the star produces iron in its core. Iron nuclei are produced through silicon fusion. Iron does not produce energy when it fuses. When iron fusion begins, no energy is produced to support the rest of the star and the core collapses quickly. A shock wave propagates through the star, and a massive burst of neutrino energy ejects the outer layers of the star in a supernova explosion.

[crazycityslicker]

TY

[joshraies]

You're welcome