Show:
The Moon
Electromagnetic Radiation
The Sun Some More
More Planets
Misc
100
The youngest features on the lunar surface are _________.
rayed craters
100
Which of the following colors has the longest wavelength?
red
100
The most conspicuous features on the surface of the Sun are dark areas called ________.
sunspots
100
What is the second planet from the Sun?
Venus
100
The length of daylight on the Moon is about _______.
two weeks
200
Depressions on the moon’s surface caused by the impact of meterorites and other debris are known as ________.
craters
200
In different situations, light behaves like ________.
waves or particles
200
Much of the Sun’s energy is produced by:
The fusion of hydrogen atoms to produce helium
200
Which one of the terrestrial planets has a surface landscape similar to that of the older areas of the Moon?
Mercury
200
________ are small, extraterrestrial particles that glow brightly and burn up as they travel through the Earth’s atmosphere.
Meteroids
300
How did the lunar maria most likely originate?
huge impact basins that were nearly filled with basaltic lava flows
300
Which of the following is NOT considered a form of electromagnetic radiation? a. radio waves b. gravity c. gamma rays d. visible light e. x-rays
gravity
300
The most explosive events to occur on the Sun are ________.
solar flares
300
According to the Ptolemaic (Greek) model of the universe, how many “heavenly” bodies could be observed wandering along the background of stars?
seven
300
In what solar system model was the sun proposed as the center of the solar system?
Heliocentric model
400
________ is a moon of Mars.
Phobos
400
Which of the following types of telescopes must be above Earth’s atmosphere to function?
an X-ray telescope
400
The Sun’s surface has a grainy texture produced by numerous bright markings called ______.
granules
400
All the planets (excluding Pluto) orbit the Sun in the same direction and in nearly the same plane of orbit.
False
400
To determine whether a celestial body is approaching or receding from Earth, astronomers employ __________.
The Doppler principle
500
The period of time required for the Moon to complete a revolution is called the ______ month.
sidereal
500
In the electromagnetic spectrum, what type of radiation has the longest wavelengths?
Radio waves
500
Major solar flares cause ________.
spectacular aurora displays on Earth
500
Hubble’s law states that galaxies are receding from us at a speed that is proportional to their ________.
distance
500
The discovery that the universe appears to be expanding led to a widely accepted theory called _________.
the Big Bang