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

Author Question: How did Herschel try to map our Galaxy 200 years ago, and why did he fail? What will be an ideal ... (Read 58 times)

humphriesbr@me.com

  • Hero Member
  • *****
  • Posts: 550
on: Jul 27, 2018
How did Herschel try to map our Galaxy 200 years ago, and why did he fail?
 
  What will be an ideal response?

Question 2

The first successful landers on the surface of Mars were:
 
  A) Mariners 4 and 5 in 1965.
  B) Vikings 1 and 2 in 1976.
  C) Voyagers 1 and 2 in 1979.
  D) Pathfinder and Sojourner in 1997.
  E) Spirit and Opportunity in 2004.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

orangecrush

  • Sr. Member
  • ****
  • Posts: 350
Reply #1 on: Jul 27, 2018
Answer to Question 1

His star counts revealed the galactic disk, but the dark nebulae of dust blocked everything except the closer spiral arms, making him think we lay near the center.

Answer to Question 2

B


humphriesbr@me.com

  • Hero Member
  • *****
  • Posts: 550
Reply #2 on: Jul 27, 2018
Thanks


orangecrush

  • Sr. Member
  • ****
  • Posts: 350
Reply #3 on: Jul 27, 2018
Welcome :)


« previous next »
 

Did you know?

The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

A Starburst Galaxy A Starburst Galaxy
U.S. adults from 25 to 74 years report that the largest proportion of their daily stressors arise ... U.S. adults from 25 to 74 years report that the largest proportion of their daily stressors arise ...
An overlapping record extends back thousands of years of tree ring width An overlapping record extends back thousands of years of tree ring width
Fornax Galaxy Cluster Fornax Galaxy Cluster
Remaining health-adjusted life expectancy (years) at age 25 Remaining health-adjusted life expectancy (years) at age 25
Nick buys a $25 000, 5.4% bond with quarterly interest coupons, 3 years before maturity, to ... Nick buys a $25 000, 5.4% bond with quarterly interest coupons, 3 years before maturity, to ...
Video: How Hemoglobin Picks Up and Delivers Oxygen

For a complete list of videos, visit our video library