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Anna > Astronomy Exam > Flashcards

Astronomy Exam Flashcards

1
Q

What is orbital radius?

A

the average distance between an object in the solar system and the sun

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2
Q

Gravitational Force

A

the force of attraction between all masses (planets, etc) in the universe

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3
Q

What did Claudius Ptolemy believe?

A

That the sun and planets revolved around Earth

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4
Q

astronomy

A

the scientific study of what is beyond earth

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5
Q

Solstice

A

astronomical event, happpens twice a year. when the North Hemisphere tilts toward the Sun/away from the Sun.

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6
Q

Equinox-when are they?

A

when day time and night time have equal hours

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7
Q

Lunar Cycle

A

all phases of the moon

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8
Q

New Moon

A

when the moon is not visible

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9
Q

Waxes

A

when the moon is at the first quarter phase.

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10
Q

Wanes

A

the moons face decreases in size

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11
Q

Solar Eclipse

A

when the moon is in between the earth and the sun

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12
Q

Lunar Eclipse

A

when the earth is in between the moon and the sun

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13
Q

Tides

A

the rising and falling of the ocean surface caused by gravitational pull.

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14
Q

celestial object

A

any object that exists in space

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15
Q

universe

A

everything that exists, including all energy, matter, and space.

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16
Q

Constellation

A

a group of stars observed from earth

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17
Q

Star Map

A

a map of the night sky used to show the positions of stars at given times and dates.

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18
Q

Planisphere

A

a type of star map used for locating stars, galaxies, constellations as well as the postions of starts at given times and dates.

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19
Q

Celestial Sphere

A

an imaginary sphere which all celestial objects are projected.

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20
Q

Celestial Equator

A

an imaginary extension of earths equator, projected into space.

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21
Q

Planetarium

A

a place to study planets, stars, galaxies etc.

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22
Q

star

A

a massive collection of gases, held together by its own gravity and emits huge amounts of energy.

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23
Q

luminous

A

producing and giving off light; shining

24
Q

sun

A

the sun is a star- an enormous ball of hot, glowing gases.

25
Q

scientific notation

A

a number between 1 and 9 multiplied by the power of 10

26
Q

Planet

A

a large, round celestial object that travels around a star.

27
Q

solar system

A

the sun and all the objects that travel around it.

28
Q

satellite

A

a celestial object that travels around a planet or dwarf planet.

29
Q

orbit

A

the closed path of a celestial object or satellite as it travels around another celestial object.

30
Q

moon

A

the moon is a type of satellite, a celestial object traveling around a planet/dwarf planet. the moon reflects the sun’s light.

31
Q

galaxy

A

a huge, rotating collection of gas, dust, and biliond of stars, planets, and other celestial objects.

32
Q

milky way

A

is are galaxy that contains the sun, planets and stars.

33
Q

electromagnetic radiation

A

energy emitted from matter, consisting of electromagnetic waves that ravel at the speed of light.

34
Q

electromagnetic spectrum

A

the range of wave lengths of electromagnetic radiation, extending from radio waves to gamma rays, and includes visible light.

35
Q

corona

A

the corona is one part of two layers, the corona being the thin outer layer of the solar (sun’s) atmosphere.

36
Q

sunspots

A

dark spots appearing on the sun’s surface that are cooler than the area surrounding them.

37
Q

Galileo Galilei

A

he was the first to believe that the earth and all planets revolved around the sun.

38
Q

Aurora Borealis

A

a display of shifting colourss in the northern sky caused by solar particals colliding with matter in Earth’s upper atmosphere.

39
Q

Aurora Australis

A

similar to Aurora borealis except in the south pole.

40
Q

Astronomical unit

A

approximately 150 million kilometers: the average distance from earth to the sun.

41
Q

dwarf planet

A

a celestial object that orbits the sun and has a spherical shape but does not dominate its orbit.

42
Q

asteroid

A

celestial objects of all sizes in the solar system composed of rock and metal.

43
Q

meteoroid

A

a piece of metal or rock in the solar system that is smaller than an asteroid.

44
Q

meteor shower

A

A meteor shower is a celestial event where lots of meteors are observed to glow/radiate. having come from one point in the night sky. meteor showers are caused by streams of cosmic debris entering Earth’s atmosphere at extremely high speeds.

45
Q

comet

A

a chunk of ice and dust that ravels in a very long orbit around the sun.

46
Q

coma

A

the gases and dust that form a gaseous cloud around the nucleus of a comet.

47
Q

light pollution

A

when too many lights sine upwards making it difficult to see stars.

48
Q

azimuth

A

the horizontal angular distance from north measured east ward.

49
Q

altitude

A

the angular height a celestial object appears to be above the horizon, measured vertically

50
Q

artificial satellites

A

man made machines sent into earths orbit which contributes to many things such as weather and tv.

51
Q

sputnik 1

A

an artificial satellite sent to space by the soviet union. 1957. mission was to orbit earth.

52
Q

Alouette 1

A

sent into space five years after sputnik with mission to orbit earth.

53
Q

RADARSAT

A

satellites in polar orbits to keep an eye on natural and human made events.

54
Q

GPS

A

a group of satellites that work together to determine the positions of given objects on the earths surface.

55
Q

kuiper belt

A

where a majority of asteriods can be found. this belt comes after our universe.

56
Q

Eris

A

a dwarf planet in the kuiper belt

57
Q

Oort cloud

A

third belt and the biggest belt. long orbiting comets are most commonly found their.

Anna (8 decks)

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