Unit 1: Space
Unit 1: Space
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Each plant rotates around its own axis. The amount of time it takes to make one rotation around its own axis is the length of one day! The earth takes 24 hours to make one rotation, thus one day on Earth is 24 hours!
Each plant rotates around its own axis. The amount of time it takes to make one rotation around its own axis is the length of one day! The earth takes 24 hours to make one rotation, thus one day on Earth is 24 hours!
Each planet also orbits the sun. The amount of time it takes for a planet to orbit the sun one time is the length of one year! It takes earth 365.25 days to orbit the sun, thus that is the length of one year on Earth! Every 4th year, we gain one day in February (Feb 29) which we call a leap year!
Each planet also orbits the sun. The amount of time it takes for a planet to orbit the sun one time is the length of one year! It takes earth 365.25 days to orbit the sun, thus that is the length of one year on Earth! Every 4th year, we gain one day in February (Feb 29) which we call a leap year!
What causes day and night?
What causes day and night?
Polar Days and Polar Nights
Polar Days and Polar Nights
Why do we have different seasons?
Why do we have different seasons?
The Phases of the Moon
The Phases of the Moon
There are 12 lunar cycles each year. Each lunar cycle takes about 1 month to complete.
The cycle starts with a new moon where we see no moon in the sky! As it grows towards a full moon, it is described as waxing. We see a waxing crescent, the first quarter (half moon), a waxing gibbous and finally a full moon.
When the full moon is out, the lunar cycle is half complete. As it shrinks towards the new moon, we describe it as waning. We see a waning gibbous, the third quarter (half moon), a waning crescent and finally, back to a new moon.
This cycle repeats each month. See the diagram below:
Asteroids, Comets, Meteoroids, Meteors and Meteorites
Asteroids, Comets, Meteoroids, Meteors and Meteorites
Asteroids: A small rocky object orbiting the sun. They range in size from nearly 1,000 km across (Ceres) to dust particles. They are mostly found in the asteroid belt (especially between the orbits of Mars and Jupiter).
Comets: Similar to an asteroid but made of ice and dust. When they get too close to the sun, the ice instantly vaporize which gives It the appearance of having a tail.
Meteoroid: A small piece of asteroid or comet that often breaks off in a collision (typically the size of a pebble).
Meteor: When a meteoroid entres the earth's atmosphere at a very high speed and burns up. We see them as shooting stars In the sky!
Meteorite: When a meteor survives the burn and lands on the ground.
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