A spaceship is moving past you at a speed very close to the speed of light. If you could somehow watch the people inside it over a long period of time, what would you conclude?
A) They are aging more rapidly than you.
B) Their mechanical clocks go slower than yours, but the people are aging at the same rate as you.
C) Their time is the same as your time.
D) They are aging more slowly than you.
Question 2
Which of the following best describes the Tropic of Cancer?
A) It is the circle of latitude on Earth for which the Sun appears to remain above the horizon for a full 24 hours on the summer solstice.
B) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the spring and fall equinoxes.
C) It is the line of right ascension passing through the constellation of Cancer.
D) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the summer solstice.
Changes in light quality with depth: (a) the rich colours on a shallow coral reef;
Astronomers identified 12-billion-year-old white dwarf stars only 100 light years away from Earth
The light reactions and chemiosmosis: the organization of the thylakoid membrane.
Fun with light refraction
Close-ups of Jupiter’s Atmosphere
The Light Curve of a Nova