Why Must Far-Infrared Astronomy Be Done from High-Flying Aircraft or Spacecraft

question 22

Multiple Choice

Why must far-infrared astronomy be done from high-flying aircraft or spacecraft?

• A)Far-infrared radiation is absorbed low in the Earth's atmosphere.
• B)Far-infrared photons are quite energetic.
• C)Far-infrared photons have long wavelengths.
• D)Far-infrared radiation is reflected from the top of the Earth's atmosphere.

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Definitions:

Slaveholding Border States

Refers to the U.S. states on the border between the North and South that permitted slavery during the Civil War but did not secede from the Union.

Radical Republicans

A faction of American politicians within the Republican Party of the United States from about 1854 until the end of Reconstruction in 1877, who believed in the immediate emancipation of the slaves and harsh repercussions for the Southern states.

Emancipation Proclamation

Declaration issued by President Abraham Lincoln; the preliminary proclamation on September 22, 1862, freed the slaves in areas under Confederate control as of January 1, 1863, the date of the final proclamation, which also authorized the enrollment of black soldiers into the Union army.

Delayed

Postponed or made later than originally planned or expected.