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

Author Question: Why was stellar parallax not measured until the 19th century? What will be an ideal ... (Read 49 times)

APUS57

  • Hero Member
  • *****
  • Posts: 571
on: Jul 27, 2018
Why was stellar parallax not measured until the 19th century?
 
  What will be an ideal response?

Question 2

Mars is often called a midway world, similar in some respects to Earth, and in others to our Moon. Explain.
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

leahchrapun

  • Sr. Member
  • ****
  • Posts: 332
Reply #1 on: Jul 27, 2018
Answer to Question 1

Stars are so far away that even the closest stars have parallax less than an arcsecond, which could not be measured without the technological developments that did not occur until the 19th century.

Answer to Question 2

Like our Moon, much of Mars is ancient cratered terrain, and its density is closer to that of the Moon than Earth. But like us, Mars has seasonal variations, polar caps, clouds, an atmosphere, dust storms, and signs of past liquid water and erosion.


APUS57

  • Member
  • Posts: 571
Reply 2 on: Jul 27, 2018
Gracias!

helenmarkerine

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Using Parallax to Determine Distance Using Parallax to Determine Distance
A Summary of Stellar Evolution A Summary of Stellar Evolution
A nineteenth-century Japanese portrait of Commodore Matthew Perry, who “opened up” Japan in 1854. A nineteenth-century Japanese portrait of Commodore Matthew Perry, who “opened up” Japan in 1854.
The Number of Children Americans Think Are Ideal The Number of Children Americans Think Are Ideal
The Last Century Trends The Last Century Trends
Predicted Temperature Trends Through the 21st Century Predicted Temperature Trends Through the 21st Century
Video: Introduction to Cystic Fibrosis

For a complete list of videos, visit our video library