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

Author Question: The great contribution of Nicholas Copernicus was to ________. A) create a detailed model of our ... (Read 27 times)

natalie2426

  • Hero Member
  • *****
  • Posts: 524
on: Jul 27, 2018
The great contribution of Nicholas Copernicus was to ________.
 
  A) create a detailed model of our solar system with the Sun rather than Earth at the center
  B) discover the laws of planetary motion
  C) discover the law of gravity
  D) prove that the Earth is not the center of the universe

Question 2

The average speed of stars relative to the Sun in the solar neighborhood is about 20 km/s. Suppose you discover a star in the solar neighborhood that is moving relative to the Sun at a much higher speed, say 220 km/s.
 
  What kind of orbit does this star probably have around the Milky Way? In what part of the galaxy does it spend most of its time? Explain.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

stanleka1

  • Sr. Member
  • ****
  • Posts: 325
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

Since stars that are traveling along with us in the disk of the Milky Way move at a velocity relative to us of only about 20 km/sec, we would reason that a star observed to be moving relative to us at a velocity of 220 km/sec was not traveling with us in the disk but was part of some other component of the Milky Way, likely the halo. The orbits of halo stars are not concentrated in the flattened disk but are distributed more like a sphere. So a halo star flying through the disk would appear to us to have the rotational speed of the disk, namely 220 km/sec.


natalie2426

  • Hero Member
  • *****
  • Posts: 524
Reply #2 on: Jul 27, 2018
TY


stanleka1

  • Sr. Member
  • ****
  • Posts: 325
Reply #3 on: Jul 27, 2018
You're welcome


« previous next »
 

Did you know?

Cyanide works by making the human body unable to use oxygen.

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?

About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

Did you know?

The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Critical Thinking Model Critical Thinking Model
Three-cell model Three-cell model
Circling the forearm to create movement at the elbow. Circling the forearm to create movement at the elbow.
A multistep model for colon cancer. The first mutation, in the APC gene, leads to the formation of p A multistep model for colon cancer. The first mutation, in the APC gene, leads to the formation of p
A model for C-to-U RNA editing A model for C-to-U RNA editing
Human and great ape chromosome evolution Human and great ape chromosome evolution
Video: Hydrogen bonds vs. Ionic bond

For a complete list of videos, visit our video library