Why would astronomers place an X-ray observatory in space, like the Chandra observatory?
A) to map X-ray emissions from the sun
B) to record X-rays emitted from the big bang; the so called background radiation of the universe
C) to map X-ray emissions from the moon
D) to map deep X-ray emissions from deep space, particularly as a proxy for materials being sucked into black holes
D
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Glasnost called for greater political openness in the former Soviet Union
Indicate whether the statement is true or false
Explain the environmental challenges for the Middle East and North Africa and evaluate which is the most serious
What will be an ideal response?
Which of the following statements is true?
A) All diols are glycols. B) All glycols contain both a primary and a secondary alcohol. C) All glycols are diols. D) All glycols must have at least three carbon atoms.
When water evaporates at Earth surface temperatures, the water surface loses more heat than when it evaporates at 100°C.
Answer the following statement true (T) or false (F)