Astronomy Flashcards
Earths rotation takes about
24 hours
One complete revolution of earth around the sun takes about
One year (365 days)
The phase of the moon you see depends on
How much of the sunlit side of the moon faces earth
Tides are caused mainly by
Differences in how much the moon pulls on different parts of earth
How large is the moon compared to earth?
About one-fourth he diameter of earth
You are less likely to see a total solar eclipse than a total lunar eclipse because
The moons shadow only covers a small area on earths surface
During a total lunar eclipse, the order if the objects would be
Sun, earth, moon
A light year is
The distance light travels in a year
The lifetime of a star depends on it’s
Mass
The Milky Way galaxy is an example of a
Spiral galaxy
The solar system formed from
A giant cloud of gas and dust
Venus and earth are much alike in terms of
Their size and density
Uranus is different from most other planets because it
Rotates on it’s side
Characteristics used to clarify stars include
Size, brightness, and temperature
What color are the coolest stars?
Red
The absolute brightness of a star depends on it’s
Size and temperature
The Hertzsprung-Russell diagram shows main-sequence stars
Increase in brightness as they increase in temperature
Which planet takes more time to complete one rotation on it’s axis than to complete one revolution around the sun?
Venus
Why is there a North Star but not a south star?
Just by chance there is a bright star near the north celestial pole
If you were at a latitude of N5 degrees, the North Star would appear to be
On the horizon, rising and falling
What do all of the inner planets have in common?
They all are small and have rocky surfaces
Astronomers predicted the existence of the asteroid belt based on
The great gap between mars and Jupiter
Order of the planets from the sun
Mercury, Venus, Earth, Mars, Asteroid Belt, Jupiter, Saturn, Uranus, Neptune, Kuiper Belt, Pluto, Charon
The half-way planet
Uranus
