space Flashcards
define mass
the amount of matter an object contains
define weight
the force of gravity on an object
state the value of the gravitational field strength on earth
9.8 N/kg
state the equation of weight
weight = mass x gravitational field strength
define light year
the distance travelled by light in one year
define galaxy
a collection of stars
name the main components of the solar system
sun
planets
moons
asteroid belt
dwarf planets
recall the order of the 8 planets in our solar system
mercury
venus
earth
mars
jupiter
saturn
uranus
neptune
what is a year
the time taken for a planet to orbit the sun
what causes day and night
the earth spinning on its axis
what causes the seasons
the tilt of the earth
list the following from smallest to biggest: solar systems moons
stars planets universe galaxies
moon
planet
sun
solar system
galaxy
universe
name the galaxy that we are in
the milky way
define star
an object in space that gives out light an heat energy
name the force that keeps planets and moons in orbit around larger objects
gravity
define natural satellite
a moon that orbits a planet
define artificial satellite
manmade objects that orbit earth; used for communications
name four methods used to investigate space
earth-based telescopes
space-based telescopes
unmanned probes
manned missions
state the standard unit for mass
kilograms (kg)
state the standard unit for weight
newton (N)
