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;
Close-up of the underside of a gecko's foot as it walks on vertical glass
For kinship analyses buccal swabs from close family are taken for comparison.
Doppler Effect, Observer Moving
Electrophoresis gel in a densitometer. (a) The green light from the slit light source is visible ...
Light-reflecting Eyes