« previous next »

Author Question: What is Olbers' paradox, and what is its resolution? What will be an ideal ... (Read 57 times)

jayhills49

  • Hero Member
  • *****
  • Posts: 559
on: Jul 27, 2018
What is Olbers' paradox, and what is its resolution?
 
  What will be an ideal response?

Question 2

You have observed the wobble in the velocity curves of two otherwise identical stars. Star A has a period of 6 months and Star B has a period of 1 year. What can you say about these stars?
 
  A) It is impossible to say anything about the planets orbiting these stars.
  B) Star B must have a planet like Earth.
  C) Star A's planet must be closer than Star B's planet.
  D) Star A's planet is more massive than Star B's planet.


SomethingSomething

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

If the universe were infinite and unchanging, the night sky should be as bright as the Sun because every line of sight should eventually end up looking at the surface of a star somewhere, and the total of all this light would make for a uniformly bright sky. Yet clearly it becomes dark when the Sun sets and that is the paradox. The resolution to this is for the universe to be either finite or changing. In particular, if the universe had a beginning, we would only be able to see a finite number of starsthose that lie within our cosmological horizonand thus we can have a dark night sky.

Answer to Question 2

C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

Did you know?

Cutaneous mucormycosis is a rare fungal infection that has been fatal in at least 29% of cases, and in as many as 83% of cases, depending on the patient's health prior to infection. It has occurred often after natural disasters such as tornados, and early treatment is essential.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Resolution Resolution
Cultures Ideal Body Types Cultures Ideal Body Types
(a) The low-resolution signal has the same number of pulses as the engine has cylinders. (b) A ... (a) The low-resolution signal has the same number of pulses as the engine has cylinders. (b) A ...
A high-resolution model of the 50S ribosomal subunit A high-resolution model of the 50S ribosomal subunit
Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ... Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ...
If CP for an ideal gas is 35.4 J/molK, which of the following is CV for this gas? If CP for an ideal gas is 35.4 J/molK, which of the following is CV for this gas?
Video: HDL (high density lipoprotein)

For a complete list of videos, visit our video library