In 2012, NASA's Spaceguard Survey Concluded That Astronomers Had Now

question 27

Multiple Choice

In 2012, NASA's Spaceguard Survey concluded that astronomers had now identified 90% of the asteroids with diameters greater than 1 km. How could astronomers know that they had reached this goal?

• A) Asteroids larger than 1 km are so rare and so big, they have always been easy to keep track of
• B) NASA is now able to keep track of everything in the solar system out to Pluto with great precision; nothing remains to be discovered in that region
• C) Most of the near-Earth objects that big are comets, and they all have big tails which are easy to see
• D) The people doing the survey began to find the same objects over again, indicating they were reaching the limits of their survey
• E) This was fake news; in fact, we can't ever know if we have found 90% of the larger near-Earth objects

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Definitions:

Inflation Expectations

The rate at which people expect prices to rise in the future, which can influence consumer and business spending behavior.

Unemployment Rate

The portion of the labor force that is out of work and actively pursuing employment opportunities.

Accommodation

Living or travel arrangements made for people while away from home, or adjustment made to make something suitable.

Bureau of Labor Statistics

A unit of the United States Department of Labor, which is responsible for collecting, processing, and disseminating statistical data on labor economics.