« previous next »

Author Question: Suppose we discover a super-Earth at a distance of 10AU from its star. Should we consider it to be ... (Read 69 times)

Tazate

  • Hero Member
  • *****
  • Posts: 532
on: Jul 27, 2018
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
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

Tazate

  • Hero Member
  • *****
  • Posts: 532
Reply #2 on: Jul 27, 2018
TY


stillxalice

  • Sr. Member
  • ****
  • Posts: 339
Reply #3 on: Jul 27, 2018
You're welcome


« previous next »
 

Did you know?

Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

Did you know?

The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

Did you know?

In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

The geological timescale and an overview of the history of life on Earth The geological timescale and an overview of the history of life on Earth
Venous Star Venous Star
Earth Earth
Wavelengths that penetrate the earth's atmosphere Wavelengths that penetrate the earth's atmosphere
Idealized Tidal Bulges on Earth Idealized Tidal Bulges on Earth
Calculate the distance from point R(17,5) to the line ... Round to the nearest tenth of a Calculate the distance from point R(17,5) to the line ... Round to the nearest tenth of a
Video: Fetal development - Weeks 9 to 38

For a complete list of videos, visit our video library