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Social Studies > Celestial Objects > Flashcards

Celestial Objects Flashcards

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1
Q

Astrology

A

Study of celestial objects outside Earth’s atmosphere.

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2
Q

Celestial Objects

A

Natural bodies visible in the sky-stars, planets, moons, asteroids, comets, galaxies, etc.

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3
Q

Stars

A

Massive, luminous spheres of plasma held together by gravity. They produce energy through nuclear fusion.

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4
Q

Closest Star to Earth?

A

Sun.

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5
Q

Types of Stars?

A

Main sequence (our Sun)
Redgiants
White dwarfs
Neutron stars
Supergiants
Red Dwarfs
Brown Dwarfs

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6
Q

Planets

A

Can be rocky (terrestrial) or gaseous (Jovian).

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7
Q

Planets in Order From Sun

A

The Sun
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
(Pluto 1930-2006)

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8
Q

What’s a Planet?

A
  1. Must orbit a star.
  2. Must be big enough to have enough gravity to force it into a spherical shape.
  3. Must be big enough that it’s gravity has cleared away any other objects of or similar size near it’s orbit around the Sun.
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9
Q

Exoplanets

A

Planets orbiting stars other than our Sun.

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10
Q

Moons

A

-Orbit planets or dwarf planets
-Can have oceans, volcanoes, craters, atmosphere

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11
Q

How Many Moons Does Our Solar System Have?

A

Our solar system has 288 known moons.

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12
Q

Largest Moon + Second Largest Moon

A

-Ganymede-Jupiter (largest)
-Titan-Saturn (2nd largest)
Both bigger than Mercury

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13
Q

Asteroids

A

Small, rocky bodies orbiting the Sun.
Most are found in the asteroid belt between Mars and Jupiter.

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14
Q

Largest + Second Largest Asteroids

A

-Ceres-25% of the total mass of the belt
-Vesta-9% of the total mass of the belt

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15
Q

Comets

A

Icy bodies that release gas and dust.

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15
Q

Who is Ceres?

A

-Ceres is the Roman goddess of corn and harvest
-“Cereal” comes from “Ceres”

16
Q

Galaxies

A

Vast collections of stars, gas, dust, and dark matter.

17
Q

What is Our Galaxy Called + How Many Stars Are in it?

A

-The Milky Way
-It has 100-400 billion stars

18
Q

What Type of Galaxy is Ours?

A

A spiral galaxy.

19
Q

Where is Our Galaxy Located?

A

In the Orion Arm.

20
Q

Black Holes

A

Regions where gravity is so strong that nothing can escape. They form from the collapse of massive stars.

21
Q

Nebulae

A

Clouds of gas and dust.

22
Q

Constellations

A

Patterns of stars as seen from Earth.

23
Q

How Many Official Constellations?

A

88 official constellations.

24
Q

What Did Galileo Galilei Discover?

A

-Saturn’s rings
-Neptune
-Sun spots

25
Q

What Did Galileo Galilei Invent?

A

-Thermometer
-Pendulum clock
-Geometric compass

Social Studies (2 decks)

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