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Me > Space Gr9 > Flashcards

Space Gr9 Flashcards

(40 cards)

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1
Q

What is Astronomy?

A

Study of celestial objects and phenomena.

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2
Q

What is a Celestial Object?

A

Natural objects outside Earth’s atmosphere (stars, planets, moons).

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3
Q

What is a Star?

A

A luminous ball of gas, mainly hydrogen, undergoing nuclear fusion (e.g., Sun).

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4
Q

What is a Planet?

A

large celestial object that travels around a star

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5
Q

What is a Moon?

A

A natural satellite that orbits a planet.

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6
Q

What is a Galaxy?

A

A massive system of stars, dust, and dark matter bound by gravity (e.g., Milky Way).

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7
Q

What are Terrestrial Planets?

A

Rocky, smaller, inner planets (Mercury, Venus, Earth, Mars).

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8
Q

What are Gas Giants?

A

Large, outer planets with thick atmospheres (Jupiter, Saturn).

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9
Q

What are Ice Giants?

A

(Often grouped with Gas Giants) Uranus and Neptune.

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10
Q

What are Dwarf Planets?

A

Smaller planetary bodies (e.g., Pluto).

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11
Q

What are Meteors?

A

“Shooting stars”; meteoroids burning in Earth’s atmosphere.

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12
Q

What are Meteorites?

A

Meteoroids that land on Earth.

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13
Q

What are Meteoroids?

A

Small space rocks traveling through space.

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14
Q

What are Asteroids?

A

Rocky bodies orbiting the Sun, mostly in the asteroid belt.

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15
Q

What are Comets?

A

Icy bodies with glowing comas and tails when near the Sun.

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16
Q

What is Earth’s Rotation?

A

Earth spinning on its axis (~24 hrs); causes day/night.

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17
Q

What is Earth’s Revolution?

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A

Earth orbiting the Sun (~365 days); causes seasons.

18
Q

What is Precession?

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A

Slow wobble of Earth’s axis over 26,000 years.

19
Q

What is the Moon’s Motion?

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A

Orbits Earth (~29.5 days); causes moon phases.

20
Q

What causes Tides?

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A

Caused by gravitational pull of the Moon and Sun; leads to high and low tides.

21
Q

What is a Solar Eclipse?

Study These Flashcards
A

Moon blocks Sun.

22
Q

What is a Lunar Eclipse?

Study These Flashcards
A

Earth blocks Sun from Moon.

23
Q

What is the Sun?

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A

A medium-sized star; source of energy via nuclear fusion (H → He).

24
Q

What causes Sunspots?

Study These Flashcards
A

Magnetic Field causes sunspots and solar flares.

25
What are Solar Spots?
Cooler, dark areas on the Sun’s surface.
26
What are the Layers of the Sun?
Core – Fusion occurs. Radiative Zone Convective Zone Photosphere – Visible surface. Chromosphere Corona – Outer atmosphere.
27
What is the Star Life Cycle for Massive Stars?
Red Supergiant → Supernova → Neutron Star or Black Hole.
28
What is the Star Life Cycle for Low/Medium Mass Stars?
Red Giant → Planetary Nebula → White Dwarf.
29
What is the Hertzsprung-Russell Diagram?
Graph plotting stars by brightness (luminosity) vs. temperature.
30
What is the Main Sequence in the H-R Diagram?
Diagonal band where most stars lie.
31
What is the Expanding Universe?
The universe is stretching; galaxies moving away from each other.
32
What is the Big Bang Theory?
Universe began ~13.8 billion years ago from a single point.
33
What is Hubble Red Shift?
Light from galaxies is red-shifted → moving away.
34
What is Cosmic Microwave Background Radiation (CMB)?
Leftover energy from the Big Bang.
35
What is Dark Matter?
Invisible mass affecting galaxy motion.
36
What is Dark Energy?
Unknown force causing acceleration of universe’s expansion.
37
What are Constellations?
Patterns of stars named by ancient cultures.
38
What is the Cultural Importance of Constellations?
Used for navigation, storytelling, and calendars.
39
What are Star Maps?
Charts showing constellations and major stars.
40
How are Star Maps used?
celestial navigation

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