« previous next »

Author Question: There are no X-ray telescopes on Earth because A) they are too expensive to buil (Read 521 times)

futuristic

  • Hero Member
  • *****
  • Posts: 638
on: Aug 27, 2013
There are no X-ray telescopes on Earth because
A) they are too expensive to build      
B) no one has yet invented an X-ray telescope that works
C) we can't figure out how to direct an X-ray beam through space
D) X-rays don't penetrate Earth's atmosphere
E) there are no astronomical objects that emit X-rays


curlz

  • Hero Member
  • *****
  • Posts: 538
Reply #1 on: Aug 28, 2013
D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Did you know?

Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

Did you know?

Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Size comparison of Earth and Uranus Size comparison of Earth and Uranus
The Sun is the nearest star to Earth. The Sun is the nearest star to Earth.
Earth Earth
Earth scientists have devised a scheme to divide the planet’s natural history into distinct time ... Earth scientists have devised a scheme to divide the planet’s natural history into distinct time ...
The Last Man on Earth The Last Man on Earth
Planet Z-34 has a mass equal to 1/3 that of Earth, a radius equal to 1/3 that of Earth, and an ... Planet Z-34 has a mass equal to 1/3 that of Earth, a radius equal to 1/3 that of Earth, and an ...
Video: A Human Karyotype Preparation Animation

For a complete list of videos, visit our video library