Tides
The moon has the greatest gravitational effect on Earth's tides because of its . . .
Which describes the movement of earth on its axis for 24 hours? Revolution or rotation?
Rotation
Summer, autumn, winter, spring (starts over again)
What is an Astronomical Unit (AU)?
The distance from the center of the Earth to the Sun
All stars are formed in a large cloud of dust and gas called a what?
Stellar nebula
The sun also tugs on the Earth's oceans, but it does not have as strong an effect because it is what?
Too far
Which describes the Earth's orbit around the Sun counterclockwise ONCE in 365 days? Revolution or rotation?
Revolution
Which season is being experienced when the Northern Hemisphere is pointed away from the sun?
Winter
What does a light year measure?
Measures distance in space
A star nebula has an abundance of what element?
Hydrogen (H)
How many tides does Earth have each day and about how many hours are they apart?
2 high tides, 2 low tides - every 6 hours
When the Northern Hemisphere of the Earth is tilted towards the sun, what season is it experiencing?
Summer
During winter do we experience MORE or LESS sunlight?
Less sunlight, so daylight hours become less.
What is a large cluster of starts and gas which usually circulates a massive black hole?
A galaxy.
Before nuclear fusion begins, gravity pulls in enough dust and gas together to form a what?
A protostar
The side of the Earth facing the moon will ALWAYS experience which tide?
High tide
Seasons experienced in the Northern and Southern hemispheres occur because of what?
The earth's tilt and revolution around the Sun.
What is Winter Solstice?
What is Summer Solstice?
Winter Solstice - Shortest day (least daylight hrs)
Summer Solstice - Longest day (most daylight hrs)
What is the name of the galaxy that we live in?
The Milky Way Galaxy
Nuclear fusion in a star begins by fusing what two elements?
Hydrogen and helium
Which tide happens at new moon and full moon?
Which tide happens at 1st and 3rd quarter moons (half moons)?
1st & 3rd Qtr - Neap Tides
The Earth's axis has a tilt of 23.5 degrees toward what?
North Star (Polaris)
What is the Spring(Vernal) and/or Autumn Equinox?
The only day of the season that has 12 hours of daylight and 12 hours of darkness (spring and fall)
Spiral
A star spends 90% of its lie in what stage?
Main sequence