When We Look at an Object That Is 1,000 Light-Years

question 69

Multiple Choice

When we look at an object that is 1,000 light-years away we see it

• A)as it was 1,000 years ago.
• B)as it was 1,000 light-years ago.
• C)as it is right now,but it appears 1,000 times dimmer.
• D)looking just the same as our ancestors would have seen it 1,000 years ago.

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Definitions:

Active Immunity

Immunity that results from the production of antibodies by the immune system in response to the presence of an antigen.

Babies

Young human offspring, particularly from birth until they can walk.

B Positive

A blood type in the ABO blood group system characterized by the presence of antigen B and the Rh factor on the surface of red blood cells.

Antigens

Antigens are substances, usually proteins or polysaccharides, that the immune system identifies as foreign or dangerous, triggering an immune response.