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

Author Question: What is proper motion? A) It is the true, not apparent, motion of a star in space. B) It is the ... (Read 52 times)

bcretired

  • Hero Member
  • *****
  • Posts: 525
on: Jul 27, 2018
What is proper motion?
 
  A) It is the true, not apparent, motion of a star in space.
  B) It is the apparent shift as we go to opposite sides of our orbit every six months.
  C) It is the annual apparent motion of a star across the sky.
  D) It is the motion of a star towards or away from us, revealed by Doppler shifts.
  E) It is the orbital motion of a star around the Galaxy.

Question 2

How does Drake define a technological civilization?
 
  A) one that can get into space
  B) one that can communicate over interstellar distances
  C) one that has a written language
  D) one that can construct metal tools
  E) one that can have the intelligence not to destroy itself


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

lou

  • Sr. Member
  • ****
  • Posts: 286
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

B


bcretired

  • Member
  • Posts: 525
Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

xthemafja

  • Member
  • Posts: 348
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

Did you know?

The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

Did you know?

Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Range of Motion of the Shoulder Joint, Internal Rotation Range of Motion of the Shoulder Joint, Internal Rotation
Range of Motion of the Hip Joint, Hyperextension Range of Motion of the Hip Joint, Hyperextension
A crescent Moon and "star" A crescent Moon and "star"
Star Map Eastern Horizon Star Map Eastern Horizon
Apparent Magnitude Scale Apparent Magnitude Scale
The perception of motion under four different conditions. The perception of motion under four different conditions.
Video: What Are Carbohydrates? Importance of Carbs & High Carb Food

For a complete list of videos, visit our video library