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6th - Astronomy

Paraphrased vocabulary from the astronomy textook

TermDefinition
axis the invisible line that Earth rotates on
rotation spinning on an axis
revolution one object moving around another
orbit the path one object takes while revolving around another
solstice the longest and shortest days of the year
equinoxes the days of the year when day equals night
force a push or a pull
law of universal gravitation all objects are attracted to one another
mass the amount of stuff in an object
weight the force of gravity acting on mass
inertia the tendency to keep moving in the same direction at the same speed
Newton's first law of motion objects in motion or at rest will stay that way until something causes a change
phases one of the apparent shapes of the moon unar een from Earth
eclipse one planetary body casting its shadow on another
umbra the darkest part of a shadow
penumbra larger, but less dark, part of a shadow
lunar eclipse Earth blocks the sun's light from hitting the moon
solar eclipse the moon blocks the sun's light from hitting earth
spring tide greatest difference between tides. happens at new and full moons
neap tide least difference between tides. happens at first and third quarters
maria the dark, flat lava flows on the surface of the moon
craters large round pits from impacts on the moon's surface
meteoroids chunks of rocks or dust from space
rocket a vehicle that pushes gas in one direction to be propelled in the other direction
thrust reaction force that propels a rocket forward
velocity speed in a direction
orbital velocity the speed needed to stay in orbit around Earth - any slower and the object will fall
escape velocity the speed needed to escape the earth's gravitational pull - any slower and it will orbit or fall
satellie an object on orbit around another object
space shuttle the american vehicle that could go into space and come back a bunch of times
space station a place to live and work in space for extended periods of time
space probe unmanned robots that travel to distant locations and send information back
rover unmanned robots that move about on other planets and send back information
vacuum a place without matter
microgravity the feeling of weightlessness in space
space spinoff a product designed for use in space that has uses here on earth - like cordless tools, or memory metal
remote sensing gathering data at a distance
geosynchronous orbit orbiting earth over the same place all the time - moving at the same rate that earth rotates.
Created by: jewen