space Flashcards

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1
Q

is the summer solstice a short period of daytime or a long period of daytime?

A

the summer solstice happens on the longest period of daytime. june 21

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2
Q

is the winter solstice a short period of daytime or a long period of daytime?

A

the winter solstice happens on the shortest period of daytime. december 21

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3
Q

what is equinox

A

equinox is when the earth is receiving the same amount of sunlight/daylight

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4
Q

geocentric method

A

a theory when the earth is at the center of the universe and the other planets orbit around the earth.

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5
Q

heliocentric method

A

people believed that the center of the universe is the sun and the other planets like earth, revolve around the sun

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6
Q

what is a sundial

A

a device that is used to measure the time with the help of the sun

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7
Q

what is a merkhet

A

a device that is used to tell what time it was at night with the help of the North Pole Star.

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8
Q

what is a astrolabe

A

a device that is used to make astronomical measurements, typically of objects in the sky

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9
Q

astronomical units

A

it is used to measure the local distances within our solar system

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10
Q

how fast does light travel

A

light travels in 300 000 km/s

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11
Q

solar winds

A

they are beams of electricity charged particles discharged by the sun in every direction

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12
Q

what is a star

A

a hot, glowing ball of gas (hydrogen) which gives off a lot of light energy

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13
Q

nebulae

A

a place in space with a huge amount of gas and dust. it contains 75% hydrogen and 23% helium. (1st stage of the star)

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14
Q

sun-like star

A

a star that is relatively similar to the sun. it will soon turn to a red-giant like star.

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15
Q

massive star

A

it has more hydrogen than the sun-like star and is much bigger.

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16
Q

white dwarf

A

as the core of the red giants star isn’t hot enough to keep the reaction going, the star will shrink and slowly become a white dwarf

17
Q

white dwarf

A

as the core of the red giants star isn’t hot enough to keep the reaction going, the star will shrink and slowly become a white dwarf

18
Q

black dwarf

A

when the white dwarf fades away completely it will turn into a cold, dark black dwarf.

19
Q

black hole

A

a black hole forms from a star that is at least 10x as massive as the sun. when the star collapses there is so much gravity in such a small area that nothing can escape the gravitational pull, even light. black holes are also super dense and cannot be seen in space.

20
Q

supernova

A

after the red-supergiant, gravity takes over causing the core of the star to collapse quickly on itself which causes a supernova. if by chance the star is not completely destroyed, then a neutron star and a black hole is left behind.

21
Q

supernova

A

after the red-supergiant, gravity takes over causing the core of the star to collapse quickly on itself which causes a supernova. if by chance the star is not completely destroyed, then a neutron star and a black hole is left behind.

22
Q

terrestrial

A

inner planets, smaller, rockier composition. Few moons

23
Q

jovian

A

outer planets, larger, gaseous and contains many moons

24
Q

asteroids

A

irregularly shaped chunks of rocks and ice that are mostly small but can be as big as 100km in diameter

25
Q

comets

A

they are known as “dirty snowballs” because they are made up of dust and ice travelling through space

26
Q

constellations

A

grouping of stars

27
Q

galaxy

A

grouping of million/billions of stars, gas, and dust which is held altogether by gravity

28
Q

meteor

A

a rock that enters the earth’s atmosphere. also known as “shooting stars”

29
Q

meteoroids

A

small pieces of rock flying through space with no particular path

30
Q

meteorite

A

if a meteor hits the earth’s surface it is known as a meteorite

31
Q

azimuth

A

a measurement of the horizontal angle clock-wise from north.

32
Q

azimuth

A

a measurement of the horizontal angle clock-wise from north. (to look AROUND the sky)

33
Q

altitude

A

a measure of the vertical angle from the horizontal to an object in the sky (to see how far you need to look UP in the sky)

34
Q

zenith

A

an imaginary point directly overhead at 90 degrees altitude. (basically in the middle top of the planet)