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

Author Question: The look-back time is a. the time it takes for the light from an object to reach Earth. b. ... (Read 102 times)

vinney12

  • Hero Member
  • *****
  • Posts: 586
on: Jul 27, 2018
The look-back time is
 
  a. the time it takes for the light from an object to reach Earth.
  b. numerically equal to the distance in light-years.
  c. smaller for more distant objects.
  d. All of the other choices are correct.
  e. the time it takes for the light from an object to reach Earth and numerically equal to the distance in light-years.

Question 2

HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would totally destroy the hydrogen atoms in the gas.
 
  a. True
  b. False
  Indicate whether the statement is true or false


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

flexer1n1

  • Sr. Member
  • ****
  • Posts: 373
Reply #1 on: Jul 27, 2018
Answer to Question 1

e

Answer to Question 2

False


vinney12

  • Member
  • Posts: 586
Reply 2 on: Jul 27, 2018
Gracias!

apple

  • Member
  • Posts: 352
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

Did you know?

The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.

Did you know?

More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

Did you know?

Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

Did you know?

No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

How noncyclic electron flow during the light reactions generates ATP and NADPH. How noncyclic electron flow during the light reactions generates ATP and NADPH.
Results from sequential study of two cohorts tested at three ages and at three different points in t Results from sequential study of two cohorts tested at three ages and at three different points in t
Older adulthood can be a time of independence and exploration as responsibilities diminish and the ... Older adulthood can be a time of independence and exploration as responsibilities diminish and the ...
Finishing techniques for the back of the body. With the recipient fully draped, gently rock the body ... Finishing techniques for the back of the body. With the recipient fully draped, gently rock the body ...
Obliquity "Tilt of Earth on its axis" Obliquity "Tilt of Earth on its axis"
A piece of glass has a thin film of gasoline floating on it. A beam of light is shining ... A piece of glass has a thin film of gasoline floating on it. A beam of light is shining ...
Video: Hemodynamics Animation

For a complete list of videos, visit our video library