Stars And The Universe

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課程筆記

The Sun as a Star

The Sun is a medium-sized star at the centre of the Solar System, composed mostly of hydrogen and helium.
It radiates energy mainly in the infrared, visible, and ultraviolet regions of the electromagnetic spectrum.
In the core, nuclear fusion converts hydrogen into helium, releasing huge amounts of energy.
Example fusion reaction: ²H + ³H → ⁴He + n (deuterium + tritium → helium + neutron).

The Sun

The Scale of the Universe

The Universe is a large collection of billions of galaxies; a galaxy is a large collection of billions of stars.
The Milky Way is one of many billions of galaxies; the Sun is one of many billions of stars in the Milky Way.
Distances between stars and galaxies are measured in light-years – the distance light travels in one year.
The Milky Way's diameter is about 100 000 light-years; light takes 100 000 years to cross it.

Hierarchy of the Universe

Star Formation

Stars form from a giant cloud of gas and dust called a nebula.
Gravitational attraction pulls particles together, forming a hot ball of gas – a protostar.
When the protostar becomes hot enough and forces balance, it becomes a stable star.
The final stages of a star's life depend on its mass (similar to the Sun or much larger).

Star formation stages

Life Cycle of a Small Mass Star (like the Sun)

After the stable stage, a small mass star becomes a red giant – outer layers expand and cool.
The outer layers are pushed away, forming a planetary nebula.
The core collapses to form a white dwarf at the centre of the nebula.

Life cycle of a small mass star

Life Cycle of a Large Mass Star

A large mass star becomes a red supergiant at the end of its life.
It explodes as a supernova, ejecting heavy elements (heavier than iron) into space.
The core of a large star collapses to form a neutron star; a very large star's core collapses to form a black hole.
The nebula from a supernova may form new stars and planets.

Life cycle of a large mass star

The Big Bang Theory

Around 13.8 billion years ago, the Universe began from a single point of high density and temperature.
A giant explosion, the Big Bang, caused the Universe to expand and cool.
Observations show distant galaxies are moving away from us, supporting that the Universe is expanding.
The expansion is like a balloon with dots – as space expands, galaxies move apart.

The Big Bang and expansion of the Universe

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練習題

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1.What is the Sun mostly made of?
Easy
- Ahydrogen and helium
- Boxygen and carbon
- Cnitrogen and iron
- Dhelium and oxygen
2.State the name of the galaxy that contains the Sun.
Easy
3.How many light-years is the diameter of the Milky Way?
Easy
- A120000
- B110000
- C90000
- D100000
4.A light-year is a unit of time.
Easy
True or false?
5.Arrange the following stages in the correct order for the life cycle of a star like the Sun.
Medium
- white dwarf
- protostar
- red giant
- nebula
- stable star
- planetary nebula
6.Which of the following is the final stage of a very large mass star?
Easy
- Awhite dwarf
- Bneutron star
- Cblack hole
- Dplanetary nebula
7.Name the process that releases energy in the core of a star.
Easy
8.Complete the sentence.
Easy
A ____ is a large collection of billions of stars.

更多題目

9.According to the Big Bang theory, the Universe began about 13.8 billion years ago.
Easy
True or false?
10.State what is formed when the core of a very large star collapses.
Easy
11.What evidence supports the Big Bang theory?
Medium
- Adistant galaxies are moving away from us
- Bstars are mostly hydrogen
- Cthe Sun is a medium-sized star
- Dthe Milky Way has billions of stars
12.What is formed during a supernova that may eventually form new stars and planets?
Easy
13.Which two elements make up most of the Sun?
Easy
- AHydrogen and helium
- BHydrogen and carbon
- CHelium and oxygen
- DCarbon and nitrogen
14.What is the definition of a light-year?
Easy
- AThe time it takes light to travel from the Sun to Earth
- BThe distance travelled by light in one year
- CThe distance from Earth to the nearest star
- DThe time taken for Earth to orbit the Sun
15.The Sun is a very large star compared to most other stars in the Milky Way.
Easy
True or false?
16.Which of the following is the correct hierarchy from smallest to largest?
Easy
- ASolar System → Galaxy → Universe
- BGalaxy → Solar System → Universe
- CUniverse → Galaxy → Solar System
- DSolar System → Universe → Galaxy
17.The Milky Way galaxy contains about 100 billion stars.
Easy
True or false?
18.Arrange the following stages in the correct order for the formation of a star like the Sun.
Easy
- Protostar
- Stable star
- Nebula
19.What is formed when a very large mass star collapses at the end of its life?
Easy
- AWhite dwarf
- BNeutron star
- CBlack hole
- DPlanetary nebula
20.A supernova occurs when a red giant explodes.
Easy
True or false?
21.Which of the following is the best evidence that the Universe is expanding?
Medium
- AThe Sun is moving away from Earth
- BDistant galaxies appear to be moving away from us
- CThe Milky Way is getting larger
- DStars are moving away from the centre of the galaxy
22.Match each stage in the life cycle of a small mass star (like the Sun) to its correct description.
Medium
- Red giant
- Planetary nebula
- White dwarf
- Outer layers pushed away
- Core collapses
- Outer layers expand and cool
23.Arrange the following stages in the correct order for the formation of a large mass star.
Medium
- Supernova
- Red supergiant
- Nebula
- Neutron star
- Protostar
24.Which of the following statements about the Sun are correct? (Select all that apply)
Medium
- AIt is a medium-sized star.
- BIt consists mostly of hydrogen and helium.
- CIt radiates most of its energy in the gamma and X-ray regions.
- DIt lies at the centre of the Solar System.
25.One light-year is the distance that light travels in one year.
Easy
True or false?
26.What is formed when the core of a very large mass star collapses?
Easy
- ANeutron star
- BWhite dwarf
- CBlack hole
- DPlanetary nebula
27.Arrange the following astronomical structures in order of increasing size (smallest first).
Easy
- Galaxy
- Solar System
- Universe
- Star
28.Which of the following are stages in the life cycle of a star much larger than the Sun? (Select all that apply)
Medium
- ARed giant
- BRed supergiant
- CSupernova
- DPlanetary nebula
- ENeutron star
29.Match each term with its correct definition.
Medium
- Galaxy
- Universe
- Nebula
- A large collection of billions of stars
- A large collection of billions of galaxies
- A giant interstellar cloud of gas and dust
30.The Milky Way is a:
Easy
- Astar
- Bgalaxy
- Cplanet
- Dnebula
31.A star is observed to have a surface temperature of 6000 K and a radius similar to that of the Sun. Which stage of its life cycle is it most likely in?
Medium
- ARed giant
- BWhite dwarf
- CStable star (main sequence)
- DProtostar
32.The table shows data for four stars. | Star | Temperature (K) | Luminosity (L☉) | |---|---|---| | A | 3000 | 100 000 | | B | 6000 | 1 | | C | 10 000 | 10 | | D | 30 000 | 1000 | Which star is most likely to be a red supergiant?
Hard
- AStar A
- BStar B
- CStar C
- DStar D
33.The Sun is a large mass star that will end its life as a black hole.
Easy
True or false?
34.Which of the following are pieces of evidence that support the Big Bang theory? (Select all that apply)
Medium
- ADistant galaxies are observed moving away from us
- BThe Milky Way is shrinking over time
- CAll stars in the Universe are the same age
- DThe Sun's temperature is steadily decreasing
35.Arrange the following stages in the correct order for the life cycle of a large mass star (from earliest to latest).
Medium
- red supergiant
- protostar
- supernova
- neutron star
- nebula
36.Match each stage in the life cycle of a star to its correct description.
Medium
- Red giant
- Planetary nebula
- White dwarf
- Expelled outer layers of a small mass star
- Core of a small mass star after collapse
- Expanded and cooled outer layers of a small mass star
37.A student suggests that the Sun is a large mass star that will end its life as a black hole. Which statement correctly evaluates this suggestion?
Medium
- AThe student is correct because the Sun is large enough to form a black hole.
- BThe student is incorrect because the Sun is a medium-sized star and will become a white dwarf.
- CThe student is correct because all stars eventually become black holes.
- DThe student is incorrect because the Sun will become a neutron star.
38.The Sun is composed mostly of hydrogen and helium.
Easy
True or false?
39.Match each term with its correct description.
Medium
- Nebula
- Protostar
- Red giant
- A hot ball of gas formed by gravitational attraction
- A cloud of gas and dust in space
- An expanding, cooling outer layer of a small mass star
40.Arrange the following stages in the correct order for the life cycle of a star like the Sun (from earliest to latest).
Medium
- white dwarf
- red giant
- stable star
- planetary nebula
- protostar
41.A student measures the distance to a star using the light-year unit. Which of the following is the correct definition of a light-year?
Easy
- AThe time it takes light to travel from the Sun to Earth
- BThe distance light travels in one year
- CThe time it takes light to travel from one side of the Milky Way to the other
- DThe distance from Earth to the nearest star
42.The Sun is a medium-sized star.
Easy
True or false?
43.What is the first stage in the life cycle of all stars?
Easy
- AProtostar
- BNebula
- CRed giant
- DWhite dwarf
44.A star has a mass much larger than the Sun. What is the final stage of its life cycle?
Easy
- AWhite dwarf
- BNeutron star
- CBlack hole
- DRed supergiant
45.The centre of our galaxy is 30,000 light-years from Earth. How many years does it take light from the centre to reach Earth?
Easy
46.State the process that releases energy in the core of a star.
Easy
47.Complete the sentences about the life cycle of a very large mass star.
Medium
After the stable star stage, a very large mass star becomes a ____. It then explodes as a ____. The final stage is a ____.
48.State one piece of evidence that supports the Big Bang theory, and say what it shows about the Universe.
Medium
49.The diameter of the Milky Way is approximately 100,000 light-years. How many years does it take light to travel from one side of the Milky Way to the other?
Easy
50.Light from a distant galaxy takes 2.5 × 10⁶ years to reach Earth. How far away is that galaxy in light-years?
Easy
51.Complete the sentence about star formation.
Easy
A star forms from a giant cloud of gas and dust called a ____. Gravitational attraction pulls particles together to form a hot ball of gas called a ____. When the forces inside become balanced, it becomes a ____ star.
52.Explain how the observation that distant galaxies are moving away from us supports the Big Bang theory.
Hard
53.The centre of our galaxy is 30,000 light-years from Earth. How many years does it take light from the centre to reach Earth?
Easy
- A30000 years
- B36000 years
- C33000 years
- D27000 years
54.The diameter of the Milky Way is approximately 100,000 light-years. How many years does it take light to travel from one side of the Milky Way to the other?
Easy
- A90000 years
- B110000 years
- C120000 years
- D100000 years
55.Light from a distant galaxy takes 2.5 × 10⁶ years to reach Earth. How far away is that galaxy in light-years?
Easy
- A2750000 light-years
- B2250000 light-years
- C3000000 light-years
- D2500000 light-years

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