Besides direct formation of a black hole in a hypernova, some ...

[colton]

Besides direct formation of a black hole in a hypernova, some think that mergers between neutron stars can create even longer-lived gamma ray bursts as well.
 
  Indicate whether the statement is true or false

Question 2

Why does Earth have an ultraviolet-absorbing stratosphere, while Venus and Mars do not?
 
  What will be an ideal response?

[honnalora]

Answer to Question 1

FALSE

Answer to Question 2

Life and oxygen also explain the presence of Earth's ultraviolet-absorbing stratosphere. In the upper atmosphere, chemical reactions transformed some of the O2 into molecules of O3, ozone. The ozone molecule absorbs solar ultraviolet energy better than O2, creating the warm stratosphere. Since Mars and Venus lack photosynthetic life, they have too little O2 and too little ozone to form a stratosphere.

[colton]

Thanks for the timely response, appreciate it

[Viet Thy]

Wow, this really help