space Flashcards
is the summer solstice a short period of daytime or a long period of daytime?
the summer solstice happens on the longest period of daytime. june 21
is the winter solstice a short period of daytime or a long period of daytime?
the winter solstice happens on the shortest period of daytime. december 21
what is equinox
equinox is when the earth is receiving the same amount of sunlight/daylight
geocentric method
a theory when the earth is at the center of the universe and the other planets orbit around the earth.
heliocentric method
people believed that the center of the universe is the sun and the other planets like earth, revolve around the sun
what is a sundial
a device that is used to measure the time with the help of the sun
what is a merkhet
a device that is used to tell what time it was at night with the help of the North Pole Star.
what is a astrolabe
a device that is used to make astronomical measurements, typically of objects in the sky
astronomical units
it is used to measure the local distances within our solar system
how fast does light travel
light travels in 300 000 km/s
solar winds
they are beams of electricity charged particles discharged by the sun in every direction
what is a star
a hot, glowing ball of gas (hydrogen) which gives off a lot of light energy
nebulae
a place in space with a huge amount of gas and dust. it contains 75% hydrogen and 23% helium. (1st stage of the star)
sun-like star
a star that is relatively similar to the sun. it will soon turn to a red-giant like star.
massive star
it has more hydrogen than the sun-like star and is much bigger.