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Module 1-lesson 2- Stars
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  • 問題数 30 • 9/28/2023

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    問題一覧

  • 1

    Are diverse entities that populate the universe, ranging from individual stars and planets the entire galaxies and cosmological structures

    Celestial objects

  • 2

    Are massive, luminous spheres of Plasma that emits light and heat due to nuclear fusion reactions occurring in their cores

    Stars

  • 3

    are the most common type of stars and include a wide range of sizes and temperature.

    main sequence stars

  • 4

    Are stars that have exhausted the hydrogen fuel in their cores.

    Giant stars

  • 5

    are even more massive and luminous than giant stars. They are often found at the end of their evolutionary path, right before they explode in a supernova.

    Supergiant stars

  • 6

    are the remnants of low- to medium-mass stars after they have exhausted their nuclear fuel.

    White dwarfs

  • 7

    are the collapsed cores of massive stars that have undergone a supernova explosion.

    Neutron stars

  • 8

    are regions of spacetime where gravity is so strong that nothing, not even light, can escape.

    Black holes

  • 9

    is a fundamental tool in the field of astronomy that graphically represents the properties of stars, particularly their luminosity (brightness) and temperature (color or spectral type). Named after astronomers Ejnar Hertzsprung and Henry Norris Russell.

    Hertzsprung-Russell diagram

  • 10

    is a measure of how bright a celestial object appears to an observer on Earth.

    Apparent Magnitude

  • 11

    is a measure of the intrinsic brightness or luminosity of a celestial object.

    Absolute magnitude

  • 12

    is a widely used classification scheme for categorizing stars based on their spectral characteristics (William Wilson Morgan and Philip C. Keenan). This system is commonly used by astronomers to describe the spectral type of stars, which provides important information about a star's temperature, composition, and evolutionary stage.

    Morgan-keenan system

  • 13

    is the star at the center of our solar system, and it plays a fundamental role in providing heat, light, and energy to the planets, including Earth.

    Sun

  • 14

    what is the star type of sun?

    Yellow dwarf

  • 15

    Age of the sun.

    4.5 billion years

  • 16

    distance of the sun.

    26,000,000 light years

  • 17

    Give the 4 solar structure.

    Core Radiative Zone Convective Zone Photosphere

  • 18

    it is the one of the type of solar structure where the nuclear fusion converts hydrogen into helium that releasing enormous energy.

    Core

  • 19

    It is the region above the core where energy from fusion photons takes thousands of years to reach the surface.

    Radiative zone

  • 20

    it is where heat is transported by the motion of hot plasma.

    Convective zone

  • 21

    it is the visible surface of the Sun where sunlight is emitted. It appears as a yellowish disk.

    Photosphere

  • 22

    Give the two solar atmosphere.

    Chromosphere Corona

  • 23

    it is a layer above the photosphere , known for its reddish color.

    chromosphere

  • 24

    It is the outermost layer of the Sun's atmosphere, visible as a halo during total solar eclipses.

    corona

  • 25

    Give the four solar activity.

    sunspots solar flares solar wind solar prominence

  • 26

    it is the dark , cooler areas on the sun's surface caused by magnetic activity.

    Sunspots

  • 27

    It is the sudden , intense burst of energy and radiation from the sun's surface.

    solar flares

  • 28

    It is the stream charged particles that flows from the sun, influencing space weather

    Solar wind

  • 29

    also known as a solar filament when observed against the solar disk.

    Solar prominence

  • 30

    it is the short cut word known for solar eclipse

    SME