The Solar System

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The Solar System

The Solar System consists of the Sun, eight planets, natural and artificial satellites, and minor planets (including dwarf planets).
The Sun is a star at the centre; it contains >99% of the Solar System's mass.
The eight planets in order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
Planets are divided into inner rocky planets (Mercury, Venus, Earth, Mars) and outer gas giants (Jupiter, Saturn, Uranus, Neptune).
A dwarf planet is similar to a planet but smaller; its gravity is not strong enough to clear its orbit of other objects.
Natural satellites (moons) orbit planets; artificial satellites (e.g., ISS) are man-made and orbit Earth.
Smaller bodies orbit larger ones: planets orbit the Sun, moons orbit planets.

The Solar System: the Sun, eight planets, natural and artificial satellites, and the asteroid belt

Light Speed Calculations

Light travels at a constant speed of 3.0 × 10⁸ m/s in a vacuum.
Objects in the Solar System are visible because they reflect sunlight; light takes time to travel these large distances.
Light from the Sun takes about 8 minutes to reach Earth, and about 5 hours to reach the outer Solar System.
The time for light to travel a distance is calculated using: time = distance / speed of light.
Example: Light from Sun to Mercury (radius 5.8 × 10¹⁰ m) takes 193 s (about 3 minutes).

Gravitational Field Strength

Orbital motion is caused by the gravitational force of attraction between two bodies.
Gravitational force acts towards the centre of the larger body and keeps the orbiting body in a circular path.
The Sun's gravitational attraction keeps planets in orbit; the force is directed from the planet to the Sun's centre.
As distance from the Sun increases, the Sun's gravitational field strength decreases.
For a circular orbit, the centripetal force is provided by the Sun's gravitational attraction.
The further a planet is from the Sun: the smaller its orbital speed and the longer its orbital period.

The Sun's gravitational force of attraction keeps the Earth in orbit around the Sun

Orbital Speed Equation

For a circular orbit, the distance travelled in one orbit is the circumference: 2πr.
The average orbital speed is given by: v = 2πr / T, where r is orbital radius and T is orbital period.
Orbital period is the time taken to complete one orbit.
The orbital radius r is measured from the centre of the body being orbited (e.g., from the Sun's centre for a planet).
If given height above a planet's surface, add the planet's radius to get the orbital radius.
Example: Hubble telescope at 560 km above Earth (Earth radius 6400 km) orbits in 96 min; its orbital speed is 7590 m/s.

Orbital radius is measured from the centre of mass of the body being orbited: r = R + h

Orbital Data and Trends

Mercury: orbital radius 57.9 million km, orbital speed 47.9 km/s, period 88 days.
Earth: orbital radius 149.6 million km, orbital speed 29.8 km/s, period 365 days.
Neptune: orbital radius 4495.1 million km, orbital speed 5.4 km/s, period 165 years.
The closest planets to the Sun have the fastest orbital speeds and shortest periods; the furthest have the slowest speeds and longest periods.

The closest planets to the Sun have the fastest orbital speeds, and the furthest have the slowest

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练习题

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1.What is the name of the star at the centre of the Solar System?
Easy
- AThe Sun
- BEarth
- CMercury
- DThe Moon
2.How many planets are there in the Solar System?
Easy
- A7
- B8
- C9
- D10
3.Arrange the following planets in order of increasing distance from the Sun.
Easy
- Earth
- Jupiter
- Mercury
- Neptune
- Saturn
- Uranus
4.The Moon is a natural satellite of the Earth.
Easy
True or false?
5.Artificial satellites are natural objects that orbit planets.
Easy
True or false?
6.Complete the sentence:
Easy
The gravitational field around a ____ is strong enough to pull in nearby objects, but that around a dwarf planet is not.
7.State one difference between a planet and a dwarf planet.
Medium
8.The radius of Mercury's orbit around the Sun is 5.8 × 10¹⁰ m. The speed of light is 3.0 × 10⁸ m/s. Calculate the time taken for light from the Sun to reach Mercury. Give your answer in seconds.
Medium
- A231
- B174
- C193
- D212

更多题目

9.Match each orbiting body to the body it orbits.
Easy
- planet
- moon
- minor planet
- artificial satellite
- the Sun
- a planet
- the Sun
- the Earth
10.As the distance from the Sun increases, what happens to the orbital speed of a planet?
Easy
- AIt increases
- BIt decreases
- CIt stays the same
- DIt first increases then decreases
11.The Hubble Space Telescope orbits Earth at a height of 560 km above the surface. Earth's radius is 6400 km. It completes one orbit in 96 minutes. Calculate its orbital speed in m/s. Use v = 2πr/T.
Hard
- A8349
- B7590
- C6831
- D9108
12.State the equation that relates orbital speed, orbital radius and orbital period.
Easy
13.The Sun is a star at the centre of the Solar System.
Easy
True or false?
14.Which of the following is the correct order of planets from the Sun?
Easy
- AMercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
- BMercury, Earth, Venus, Mars, Jupiter, Saturn, Uranus, Neptune
- CVenus, Mercury, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
- DMercury, Venus, Earth, Mars, Saturn, Jupiter, Uranus, Neptune
15.What is a dwarf planet?
Easy
- AAn object similar to a planet but much smaller, whose gravitational field is not strong enough to pull in nearby objects
- BA small star that orbits the Sun
- CA moon that orbits a planet
- DAn artificial satellite
16.The Moon is an artificial satellite of the Earth.
Easy
True or false?
17.Arrange the following planets in order of increasing distance from the Sun: Earth, Jupiter, Mars, Mercury.
Easy
- Mercury
- Earth
- Mars
- Jupiter
18.Arrange the following planets in order of increasing distance from the Sun: Mars, Earth, Venus, Mercury.
Easy
- Mercury
- Venus
- Earth
- Mars
19.Which of the following are natural satellites? (Select all that apply)
Easy
- AThe Moon
- BInternational Space Station
- CA moon of Jupiter
- DA communications satellite
20.A dwarf planet has a gravitational field strong enough to pull in all nearby objects.
Easy
True or false?
21.The orbital radius of a planet is 2.0 × 10¹¹ m and its orbital period is 3.0 × 10⁷ s. What is its orbital speed?
Medium
- A4.2 × 10⁴ m/s
- B4.2 × 10³ m/s
- C2.1 × 10⁴ m/s
- D2.1 × 10³ m/s
22.Arrange the following planets in order of increasing orbital period: Earth, Jupiter, Mercury, Neptune.
Medium
- Mercury
- Earth
- Jupiter
- Neptune
23.Which of the following statements about gravitational field strength and orbital motion are correct? (Select all that apply)
Medium
- AAs distance from the Sun increases, the Sun's gravitational field strength decreases.
- BThe orbital speed of a planet increases as its distance from the Sun increases.
- CThe centripetal force on a planet is provided by the Sun's gravitational attraction.
- DOuter planets have shorter orbital periods than inner planets.
24.Four planets have the orbital radius and orbital period shown below. Which planet has the smallest orbital speed?
Hard
- APlanet with orbital radius 108.2 million km and orbital period 225 days
- BPlanet with orbital radius 227.9 million km and orbital period 687 days
- CPlanet with orbital radius 778.6 million km and orbital period 11.9 years
- DPlanet with orbital radius 4495.1 million km and orbital period 165 years
25.Which of the following statements about the gravitational field strength of the Sun and orbital motion are correct? (Select all that apply)
Medium
- AThe Sun's gravitational field strength decreases as distance from the Sun increases.
- BThe orbital speed of a planet increases as its distance from the Sun increases.
- CThe Sun's gravitational attraction provides the centripetal force for planets.
- DThe orbital period of a planet decreases as its distance from the Sun increases.
26.The International Space Station is an example of a natural satellite.
Easy
True or false?
27.Arrange the following planets in order of increasing orbital period (shortest to longest).
Easy
- Earth
- Mars
- Jupiter
- Neptune
28.A student measures the time for light from the Sun to reach Earth using a model. Which piece of apparatus is essential for this measurement?
Easy
- Astop-clock
- Bbalance
- Cthermometer
- Dmeasuring cylinder
29.The gravitational field strength of the Sun decreases as the distance from the Sun increases.
Easy
True or false?
30.A student uses a model to simulate planetary orbits. Which factor most affects the orbital speed of a model planet?
Easy
- Athe mass of the model planet
- Bthe distance from the central mass
- Cthe colour of the model planet
- Dthe temperature of the model planet
31.The Sun contains more than 99% of the mass of the Solar System.
Easy
True or false?
32.Which of the following is a natural satellite of Earth?
Easy
- AThe International Space Station
- BThe Moon
- CMars
- DThe Sun
33.Four planets have the orbital radius and orbital speed shown below. Which planet has the largest orbital speed?
Medium
- APlanet A: radius 57.9 million km, speed 47.9 km/s
- BPlanet B: radius 149.6 million km, speed 29.8 km/s
- CPlanet C: radius 778.6 million km, speed 13.1 km/s
- DPlanet D: radius 4495.1 million km, speed 5.4 km/s
34.The Sun's gravitational field strength is the same at all distances from the Sun.
Easy
True or false?
35.Which statement about dwarf planets is correct?
Easy
- AA dwarf planet has a gravitational field strong enough to pull in all nearby objects.
- BA dwarf planet orbits the Sun and is much smaller than a planet.
- CA dwarf planet is a natural satellite of a planet.
- DA dwarf planet is a star that has run out of fuel.
36.There are nine planets in the Solar System.
Easy
True or false?
37.Artificial satellites are manmade objects that orbit another object in space.
Easy
True or false?
38.Which of the following is a dwarf planet?
Easy
- AMercury
- BPluto
- CEarth
- DNeptune
39.The gravitational field around a dwarf planet is strong enough to pull in nearby objects.
Easy
True or false?
40.Complete the sentence: The Sun is a ___ at the centre of the Solar System.
Easy
The Sun is a ____ at the centre of the Solar System.
41.The radius of Mercury's orbit around the Sun is 5.8 × 10¹⁰ m. The speed of light is 3.0 × 10⁸ m/s. Calculate the time taken for light from the Sun to reach Mercury.
Medium
42.Complete the sentence: The Sun contains more than ___% of the mass of the Solar System.
Easy
The Sun contains more than ____% of the mass of the Solar System.
43.The speed of light is 3.0 × 10⁸ m/s. Light from the Sun takes 500 s to reach a planet. Calculate the distance from the Sun to that planet in metres.
Medium
44.A satellite orbits Mars at a height of 300 km above its surface. The radius of Mars is 3400 km. The satellite completes one orbit in 120 minutes. Calculate its orbital speed in m/s. Use π = 3.14.
Hard
45.Explain why the outer planets have longer orbital periods than the inner planets.
Medium
46.The speed of light is 3.0 × 10⁸ m/s. Light from the Sun takes 500 s to reach a planet. Calculate the distance from the Sun to that planet in metres.
Easy
- A180000000000 m
- B135000000000 m
- C150000000000 m
- D165000000000 m
47.A satellite orbits Mars at a height of 300 km above its surface. The radius of Mars is 3400 km. The satellite completes one orbit in 120 minutes. Calculate its orbital speed in m/s. Use π = 3.14.
Hard
- A3551 m/s
- B2905 m/s
- C3874 m/s
- D3228 m/s

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