Author Question: Suppose we discover a super-Earth at a distance of 10AU from its star. Should we consider it to be ... (Read 59 times)

Tazate

  • Hero Member
  • *****
  • Posts: 532
Suppose we discover a super-Earth at a distance of 10AU from its star. Should we consider it to be potentially habitable?
 
  A) Yes, its atmosphere may contain substantial amounts of greenhouse-type gases that can keep the planet warm beyond the usual boundaries assumed for habitable zones.
  B) Yes, because its host star must be much bigger in order to have a super-Earth, so it will be much hotter there.
  C) No, only planets at approximately 1AU will ever be potentially habitable.
  D) No, greenhouse gases freeze-out at those distances.

Question 2

Collisions between galaxies is thought to
 
  A) have stopped about 5 billion years ago.
  B) be commonplace.
  C) have never occurred.
  D) be extremely rare.
  E) have only occurred between 10 and 15 billion years ago.



stillxalice

  • Sr. Member
  • ****
  • Posts: 339
Answer to Question 1

A

Answer to Question 2

B



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question


 

Did you know?

In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Did you know?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

For a complete list of videos, visit our video library