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AS101 > 9/7/18 Our Place in the Universe > Flashcards

9/7/18 Our Place in the Universe Flashcards

1
Q

a large, glowing ball of gas that generates heat and light through nuclear fusion

A

sun

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2
Q

a moderately large object that orbits a star; it shines b y reflected light, rock or gaseous

A

planet

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3
Q

an object that orbits a planet

A

moon / satellite

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4
Q

a relatively small and rocky object that orbits a star, not big enough/not enough gravity to be a sphere, typically has an irregular shape

A

asteroid

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5
Q

a relatively small and icy object that orbits a star

A

comet

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6
Q

What is the difference between an asteroid and a comet?

A

asteroid is rocky

comet is icy

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7
Q

a star and all the materials that orbit it, including its planets and moons

A

solar (star) system

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8
Q

a great island of stars in space, all held together by gravity and orbiting a common center

A

gravity

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9
Q

a collection of galaxies bound together by gravity

A

local group

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10
Q

a gigantic region of space in which many groups and clusters of galaxies are packed more closely together than elsewhere in the universe

A

supercluster

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11
Q

the sum total of all matter and energy; that is, everything within and between galaxies

A

universe

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12
Q

astronomical unit

A
  • Earth’s average distance from the Sun
  • 150 million km (1.5E8 km)
  • Describes distances within our solar system
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13
Q

light year

A
  • the distance light can travel in 1 year
  • about 10 trillion (10E13) km (6 trillion miles)
  • unit of distance, not of time
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14
Q

measured age of the universe

A

14 billion years

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15
Q

at great distances, we see objects…

A

as they were when the universe was younger

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16
Q

Why do we see the Andromeda Galaxy as it looked 2.5 million years ago?

A

It’s 2.5 million lightyears away

17
Q

Earth’s cosmic address from smallest to largest (5)

A 
Earth
Solar System
Milky Way
Local Group
Universe

AS101 (3 decks)

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