This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Explain how we can estimate that there are about 50-100 billion galaxies in the observable universe. ... (Read 53 times)

justinmsk

  • Hero Member
  • *****
  • Posts: 524
on: Jul 27, 2018
Explain how we can estimate that there are about 50-100 billion galaxies in the observable universe.
 
  What will be an ideal response?

Question 2

Which statement is true of Venus' surface?
 
  A) There are no shield volcanoes.
  B) Atmospheric pressure is very low.
  C) It has remained unchanged for billions of years.
  D) There is an extensive hydrosphere.
  E) There are two continent sized uplands.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

yahahah24021

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jul 27, 2018
Answer to Question 1

While it's impossible to count so many galaxies one by one, we can observe a small part of the sky in detail and then extrapolate to get the total number. As an example, the Hubble deep field shows thousands of galaxies in a very small angular patch in the sky (about equal to the size of a grain of sand held at arm's length). Multiplying the number of galaxies by the ratio of the angular area of the entire sky to the angular area of the deep field then gives an estimate of the total number of galaxies in the observable universe.

Answer to Question 2

C


justinmsk

  • Member
  • Posts: 524
Reply 2 on: Jul 27, 2018
Wow, this really help

brbarasa

  • Member
  • Posts: 308
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

Did you know?

Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

Uranus revolves around the Sun once every 84 Earth years. Its average distance from the Sun is rough Uranus revolves around the Sun once every 84 Earth years. Its average distance from the Sun is rough
A Cluster of Galaxies A Cluster of Galaxies
Galaxies with Rings Galaxies with Rings
Galaxies Forming by Combining Smaller Units Galaxies Forming by Combining Smaller Units
Galaxies Forming by Combining Smaller Units Galaxies Forming by Combining Smaller Units
Big Picture of the Evolution of the Universe Big Picture of the Evolution of the Universe
Video: Anatomy and Chemical Makeup of a Single Hair (Animation)

For a complete list of videos, visit our video library