« previous next »

Author Question: There are no X-ray telescopes on Earth because A) they are too expensive to buil (Read 613 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?

Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Did you know?

As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

Did you know?

For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.

The Sun as it appears from the surface of Earth before sunset. The Sun as it appears from the surface of Earth before sunset.
The Sun is the nearest star to Earth. The Sun is the nearest star to Earth.
Earth’s history spans 4.5 billion years. Geologists and paleontologists have pieced together the his Earth’s history spans 4.5 billion years. Geologists and paleontologists have pieced together the his
How Does Earth Work? Physical Geology and the Process of Science, 2nd Edition How Does Earth Work? Physical Geology and the Process of Science, 2nd Edition
Earth 65 Million Years Ago Earth 65 Million Years Ago
Earth day kids Earth day kids
Video: Chronology of leptin research (A history of leptin research)

For a complete list of videos, visit our video library