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PHYSICAL SCI > 31.1, 31.2, 31.3, & 31.4 vocab > Flashcards

31.1, 31.2, 31.3, & 31.4 vocab Flashcards

1
Q

constellation

A

a group of stars that appears to form a pattern or picture to name stars in the sky

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2
Q

radio teloscope

A

antenna and radio receiver used to detect radio waves from astronomical radio sources in the sky

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3
Q

light year

A

distance that light travels in one year 9.5 trillion km

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4
Q

spectroscope

A

an apparatus for producing and recording spectra for examination

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5
Q

nebula

A

an interstellar cloud of gas, ice, and dust

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6
Q

main sequence

A

section of the H-R diagram that is plotted from upperleft to the lower right

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7
Q

supernova

A

a gigantic explotionof a star in which the temperature withinthe collapsing star reaches 10 billion k

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8
Q

neutron star

A

after a atar explods it leaves behind a ball of neutrons

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9
Q

black hole

A

a region of space having a gravitational field so intense that no matter or radiation can escape

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10
Q

photosphere

A

the luminous envelope of a star from which its light and heat radiate

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11
Q

sunspots

A

temporary phenomena on the Sun’s photosphere that appear as spots darker than the surrounding areas

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12
Q

giant star

A

lat stages of a star life cycle having a relatively large radius for its mass and temperature

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13
Q

white dwarf

A

a small very dense star that is typically the size of a planet

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14
Q

galaxy

A

a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction

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15
Q

milky way

A

is the galaxy that contains our Solar System, with the name describing the galaxy’s appearance from Earth

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16
Q

local group

A

is the group of galaxies that includes our galaxy

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17
Q

cosmology

A

the science of the origin and development of the universe

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18
Q

big bang theory

A

leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today

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19
Q

cosmic background radiation

A

electromagnetic radiation from the Big Bang

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20
Q

dark matter

A

a form of matter thought to account for approximately 85% of the matter in the universe

21
Q

dark energy

A

the name given to the mysterious force that’s causing the rate of expansion of our universe to accelerate over time, rather than to slow down

22
Q

where do stars form from?

A

nebula

23
Q

how do constilations ge their names

A

characters from storys animales and tools

24
Q

what is the name of the great hunter

A

orions belt

25
Q

what are the names of orions hunting dogs

A

canis major and canis minor

26
Q

what do canis maijor and canis minor mean

A

big dog and little dog

27
Q

how many basic optical teloscopes are there

A

2

28
Q

whad does refracting telescope’s use

A

convex lense

29
Q

what do reflecting telescopes use

A

mirror

30
Q

why are space telescopes better to use then ground based

A

cause of cloud polution

31
Q

what things cna a specrto determan about a star

A

chemical composition, surface temperature, and if its moving away or tword earth

32
Q

stars farther from earth are what color and what ar its wave linghts

A

red and lest spread out frequency

33
Q

stars closer to earth are what color and what is the wave linghts

A

blue and more frequent

34
Q

how do stars form

A

nebula

35
Q

whad does the H-R diagrm stand for

A

Hertzsprung-Russll Diagram

36
Q

what is out sun known as

A

giant star

37
Q

what are the interier layer of the sun

A

core, radiation zone, convection zone

38
Q

what is the surface of the sun

A

photoshpere

39
Q

are sunspots cooler in sirten areas

A

yes

40
Q

are they purminate

A

no

41
Q

what are the three types of galaxys

A

spiral eliptical irregular

42
Q

what shapoe is the milky way galaxy

A

spiral

43
Q

how many are in our local group

A

50

44
Q

what are the two largest galaxys in the local group

A

amdromeda and milky way

45
Q

where is the milky way located

A

center of one of the arms

46
Q

how long ago did the big bang accure

A

13.7 billion years ago

47
Q

what is the name of the effect that shows wave leagths

A

doppler effect

48
Q

what is the universe made of

A

regular matter and dark matter

PHYSICAL SCI (5 decks)

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