« previous next »

Author Question: There are no X-ray telescopes on Earth because A) they are too expensive to buil (Read 499 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?

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

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Earth’s Magnetic Field Earth’s Magnetic Field
Layers are deposited parallel to Earth’s surface. Younger layers are deposited on top of older layer Layers are deposited parallel to Earth’s surface. Younger layers are deposited on top of older layer
How Orbital Eccentricity Changes the Amount of Solar Radiation Earth Receives How Orbital Eccentricity Changes the Amount of Solar Radiation Earth Receives
Earth-Moon-Sun Positions during the Neap Tide Earth-Moon-Sun Positions during the Neap Tide
Escape Speed from Earth Escape Speed from Earth
Earth 430 Million Years Ago Earth 430 Million Years Ago
Video: Diversity of Living Creatures - Charles Darwin & the Beagle's Voyage

For a complete list of videos, visit our video library