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Home Q & A Board Science-Related Homework Help Physics Astronomy
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vietquocnguyen vietquocnguyen
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6 years ago
The Mars Rovers found undisputed microfossils, proving life once existed on Mars.
 
  Indicate whether the statement is true or false

Question 2

Calculations show that gravity begins to overcome thermal pressure in clouds that are
 
  A) less massive than the Sun.
  B) more massive than the Sun.
  C) more massive than ten times the Sun.
  D) more massive than a hundred times the Sun.
  E) more massive than a thousand times the Sun.

Question 3

Which is closest to the average distance between asteroids in the asteroid belt?
 
  A) 1 thousand km
  B) 10 thousand km
  C) 100 thousand km
  D) 1 million km
  E) 10 million km

Question 4

Scientists have proved that an asteroid or comet impact approximately 65 million years ago caused the extinction of the dinosaurs.
 
  Indicate whether the statement is true or false

Question 5

As a star forms, the photosphere first appears:
 
  A) when the planetary nebula is expelled.
  B) when the protostar forms.
  C) when contraction slows down.
  D) when nuclear fires ignite.
  E) when the star reaches the main sequence.
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Nax101Nax101
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6 years ago
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vietquocnguyen Author
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6 years ago
this is exactly what I needed
Tim0301
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Yesterday
Thanks
jakechambo3
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2 hours ago
This calls for a celebration Person Raising Both Hands in Celebration
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