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30 Cards in this Set

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What is a Polaris?
the North Star
Define revolution.
the movement of an object around another object or point.
one complete orbit by the Earth around the sun is about 365 days.
Define rotation.
the spinning motion of an object on its axis.

It takes about 24 hours for Earth to make one complete rotation
Define Supernova
an exploding star
Define reflecting telescope.
a type of telescope that uses mirrors
Define refracting telescope.
a type of telescope that uses lenses to gather light
Where is Mercury located?
the planet closest to the Sun
Who is Copernicus?
an astronomer who discovered the Earth revolves around the Sun
Define freefall.
The motion of a free falling
object, such as a spacecraft in orbit around the Earth
Astronauts experience this in space feel weightless
Define sprial.
Shape of the Milky Way galaxy
Define Constellation
a group of stars that form a fixed pattern in the night sky.
Define comet
A small object in space, made of ice, dust, gas and rock, that orbits a star and that can form a gaseous tail
Define axis.
An imaginary rod stretching through the planet between the North and South poles
Define star
a huge globe of hot gases that shines by its own light
Define planet
a large object that circles a star and does not produce light on its own
Define meteor.
Dust particles that speed up into our atmosphere and burn up.
Shooting Stars
Define Meteorite.
The remaining material of a meteor that has landed on the ground.
Define the Milky Way Galaxy.
A gigantic cluster of billions of stars that is home to our solar system.
Define Solar System.
Consists of a star and the objects that revolve around it.
Name the planets starting with the furthest from the sun.
Pluto, Neptune, Uranus, Saturn, Jupiter, Mars, Earth, Venus, Mercury
Who is Ptolemy?
an astronomer who lived in the second century who worked out a model of the planets: a geocentric model. The planets revolved around the Earth.
Define Galaxy?
a huge collection of stars.
What are the shapes of the galaxy?
elliptical, spiral, irregular
What does the human body feel like in Space?
weightless, the head swells from the blood moving towards the head from the legs, the waist get thinner, muscles have to work less as does the heart, the heart becomes smaller, the bones lose calcium, muscles lose shape, you become taller
Define Biosphere.
a self-contained and self-sustaining natural system
Define zero gravity.
condition deep in space where gravity is not present
Define weightlessness.
feeling experienced in free fall.
define microgravity.
conditions in free fall with gravity still present.
How would you sleep in space?
The bed has to be tied down.
How is food stored in space?
Food and drink is kept in sealed packages and consumed carefully.