All of the stars we see at night with our unaided eyes are within
A) 10,000 light-years, which is a small portion of our galaxy.
B) 100,000 light-years, which encompasses most all of our galaxy.
C) 5 million light-years, which encompasses our local group.
D) 14 billion light-years, which encompasses the observable universe.
Question 2
The observable universe is
A) the minor portion of the universe we can observe.
B) the part of the universe that is within the visible electromagnetic spectrum.
C) part of the universe visible to the unaided eye.
D) about 100 billion light years across.
Changes in light quality with depth: (a) the rich colours on a shallow coral reef;
Evidence that Light Travels at a Finite Speed
Growth of the body and brain is dramatic over the first 2 years.
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