PDF Notes: SOLAR SYSTEM

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    What defines the Milky Way?

    It is a barred spiral galaxy containing our Solar System.

    What is the nearest galaxy to the Milky Way?

    Andromeda Galaxy.

    What is cosmology?

    The study of the Universe's origin and structure.

    What causes the accelerated expansion of the Universe?

    The increase in distance of celestial bodies.

    What is the Big Bang Theory?

    It explains the Universe's origin from an explosion 13.8 billion years ago.

    What is the Nebula Theory?

    It describes the formation of the Solar System from a giant cloud of dust and gas.

    What are celestial bodies?

    Objects in space, including stars, planets, and moons.

    How do luminous and non-luminous bodies differ?

    Luminous bodies emit their own light; non-luminous bodies reflect light.

    What is a light year?

    A measure of distance equal to 9.63 trillion kilometers.

    What is the Planetesimal Hypothesis?

    It explains how planets formed from small solid objects in the Solar System.

    What is the Sun's primary composition?

    Hydrogen (73%) and Helium (25%).

    What distinguishes terrestrial planets from jovian planets?

    Terrestrial planets are rocky; jovian planets are gas giants.

    What is unique about Mercury?

    It is the closest and smallest planet in the Solar System.

    Why is Venus called Earth's twin?

    Due to its similar mass and size.

    What makes Earth special among planets?

    It supports life and has abundant water.

    What is Mars known for?

    Its red color from iron oxide and the largest volcano, Olympus Mons.

    What characterizes Saturn?

    It has prominent rings and is the least dense planet.

    What is Jupiter's notable feature?

    It is the largest planet with a short rotation period.

    What is the significance of Titan?

    It is the largest moon of Saturn and may support life.

    What is the rotation direction of most planets?

    Most rotate counterclockwise, except Venus and Uranus.

    What happens to meteoroids entering Earth's atmosphere?

    They burn up and create shooting stars.