Question 1

Which of the following best describes the Nebular Condensation Theory for the origin of the Solar System?

Accepted Answer

The Solar System formed from a spinning cloud of gas and dust that contracted, heated up, and flattened into a disk, with the Sun forming at the center and planets forming from collisional aggregation of planetesimals.

Question 2

According to Kepler’s third law, what is the relationship between the period $$T of a $$planet’s orbit and its average distance $$d$$ from the Sun?

Accepted Answer

$$T^2$$ \propto $$d^3$$

Question 3

Which of the following is NOT a characteristic of terrestrial planets?

Accepted Answer

They have deep atmospheres composed mainly of hydrogen and helium.

Question 4

Why does the Sun contain more than 99.8% of the total mass of the Solar System?

Accepted Answer

Because during the formation of the Solar System, most of the material in the nebula was pulled to the center by gravity, forming the Sun.

Question 5

Which planet has a day (rotation period) that is longer than its year (orbital period)?

Accepted Answer

Venus

Question 6

What is the main reason why Venus has a much hotter surface than Earth, despite being only slightly closer to the Sun?

Accepted Answer

Its thick atmosphere of carbon dioxide causes a strong greenhouse effect.

Question 7

Which of the following statements about the asteroid belt is correct?

Accepted Answer

It is located between the orbits of Mars and Jupiter.

Question 8

A meteorite is best described as:

Accepted Answer

A fragment of a meteoroid that survives passage through Earth’s atmosphere and lands on the surface.

Question 9

Which of the following is a reason why Pluto is classified as a dwarf planet and not a planet?

Accepted Answer

It does not dominate its orbital zone.

Question 10

Which of the following best explains why Uranus experiences extreme seasons?

Accepted Answer

Its axis is tilted by about $$98^{\circ}$$, placing its equator almost perpendicular to its orbit.

Question 11

Jupiter radiates more energy into space than it receives from the Sun. What is the most likely explanation for this phenomenon?

Accepted Answer

Jupiter is still contracting under its own gravity, releasing gravitational energy as heat.

Question 12

Which of the following is a property of comets as they approach the Sun?

Accepted Answer

Their tails always point away from the Sun due to the solar wind.

Question 13

Which of the following is a significant piece of evidence supporting the Nebular Theory of Solar System formation?

Accepted Answer

We observe stars forming in other interstellar gas clouds.

Question 14

Which of the following best describes the composition of Jupiter and Saturn?

Accepted Answer

Primarily hydrogen and helium, with traces of methane, water, and ammonia.

Question 15

Which of the following is true about the Galilean moons of Jupiter?

Accepted Answer

Ganymede and Callisto are larger than Mercury.

Question 16

Which planet has the lowest average density, even less than water?

Accepted Answer

Saturn

Question 17

What is the main source of short-period comets in the Solar System?

Accepted Answer

The Kuiper Belt

Question 18

Which of the following is a correct statement about the Earth's Moon?

Accepted Answer

It rotates synchronously with its orbit, so the same side always faces Earth.

Question 19

Which of the following is a plausible explanation for the formation of the Moon?

Accepted Answer

A planetesimal at least as large as Mars collided with the proto-Earth, ejecting material that formed the Moon.

Question 20

Which of the following is a key difference between asteroids and comets?

Accepted Answer

Asteroids are mostly rocky or metallic, while comets are composed of ice, dust, and rock.

The Solar System: Structure, Formation, and Planetary Properties

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