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 50 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
:D TYSM

ghepp

  • Member
  • Posts: 361
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

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?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

Did you know?

Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

Apparent motion of Alpha Centauri relative to Beta Centauri Apparent motion of Alpha Centauri relative to Beta Centauri
Apparent Magnitude Scale Apparent Magnitude Scale
Mass Loss by a Supermassive Star Mass Loss by a Supermassive Star
Mensuration: A goniometer is used to measure the range of motion of a joint. Mensuration: A goniometer is used to measure the range of motion of a joint.
A star link-type network where all of the modules are connected together using splice packs. A star link-type network where all of the modules are connected together using splice packs.
Video: Dietary Cholesterol & LDL

For a complete list of videos, visit our video library