What Causes The Phases Of The Moon?

00:04:33
https://www.youtube.com/watch?v=Jip3BbZBpsM

Ringkasan

TLDRThe video explains the phases of the moon, which are caused by the moon's position relative to the Earth and the Sun. It describes how the moon is illuminated by the Sun and how our perspective changes as the moon orbits the Earth, leading to different phases like new moon, first quarter, and full moon. The video also discusses lunar eclipses, explaining why the moon appears red during an eclipse due to the refraction of light by Earth's atmosphere. Additionally, it highlights the significance of lunar eclipses in studying the atmospheres of exoplanets, as the light reflecting off the moon can provide insights into the composition of alien atmospheres.

Takeaways

  • 🌕 The moon's phases are due to its position relative to the Earth and Sun.
  • 🌑 A new moon occurs when the moon is between the Earth and Sun.
  • 🌗 The first quarter shows half of the moon illuminated.
  • 🌝 A full moon is when the entire face of the moon is illuminated.
  • 🌒 The moon's orbit is tilted, preventing it from being blocked by Earth's shadow during full moons.
  • 🌕 A total lunar eclipse turns the moon red due to atmospheric refraction.
  • 🔭 Lunar eclipses can help study the atmospheres of exoplanets.
  • 🌌 Light reflecting off the moon can indicate the presence of ozone or carbon dioxide.
  • 💧 Water vapor detection on exoplanets could suggest potential for life.
  • 🌍 Studying lunar eclipses enhances our understanding of the universe.

Garis waktu

  • 00:00:00 - 00:04:33

    The speaker discusses the phases of the moon, explaining that they are caused by the relative positions of the Earth, Moon, and Sun. The phases occur as the Moon orbits the Earth, changing our perspective of its illuminated side. A new moon occurs when the Moon is between the Earth and the Sun, while a full moon happens when the Moon is on the opposite side of the Earth from the Sun. The speaker also notes that the Moon's orbit is tilted, preventing it from passing through the Earth's shadow during most full moons.

Peta Pikiran

Video Tanya Jawab

  • What causes the phases of the moon?

    The phases of the moon are caused by the moon's position relative to the Earth and the Sun, changing our perspective on the illuminated half of the moon.

  • Why doesn't the Earth block the moon's light during a full moon?

    The moon's orbit is tilted about 5° to the Earth's orbit, so it usually moves just above or below the Earth's shadow during a full moon.

  • What is a total lunar eclipse?

    A total lunar eclipse occurs when the full moon passes through the Earth's shadow, turning red due to atmospheric effects.

  • Why does the moon appear red during a lunar eclipse?

    The moon appears red because Earth's atmosphere refracts light, scattering blue light and allowing red light to reach the moon.

  • How can lunar eclipses help in studying exoplanets?

    By analyzing the light that passes through Earth's atmosphere and reflects off the moon during a lunar eclipse, scientists can infer the atmospheric composition of exoplanets.

  • What atmospheric components can be detected using lunar eclipses?

    Scientists can detect ozone, carbon dioxide, and water vapor in Earth's atmosphere by studying the spectrum of light reflected off the moon.

  • What does the presence of water vapor on an exoplanet suggest?

    The presence of water vapor could indicate the potential for life on that exoplanet.

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Teks
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Gulir Otomatis:
  • 00:00:00
    [Applause]
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    now I've been around Sydney and I've
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    asked people what causes the phases of
  • 00:00:05
    the moon and you know what they
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    say how do we get the faces of the
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    Moon uh because of the the Earth blocks
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    the the light that comes from the Sun a
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    full moon is basically where we're
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    seeing the full uh circle of the Moon
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    reflected back to Earth but the light is
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    actually coming from the Sun and the
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    Cresent with the crants are caused by
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    the Shadows of the Earth
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    from the Sun onto the moon the phases of
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    the moon is that about the Sun and the
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    Moon and the and the something goes in
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    front of something the Earth between
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    this moon and the sun we won't see the
  • 00:00:45
    moon and then it as it goes around the
  • 00:00:48
    earth gets out of the way so More Of The
  • 00:00:49
    Sun Shines on the moon and we can see
  • 00:00:50
    the moon I think so let's try to resolve
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    it what really causes the phases of the
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    moon phases of the moon um for we need
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    to know a couple of things first one is
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    there's only one source of light in the
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    solar system and that's the Sun so at
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    the center of the solar system it
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    produces all the light so both the Earth
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    and the moon are half illuminated by
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    that one source of light as the moon
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    moves around the earth our perspective
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    on it changes because sometimes we see
  • 00:01:18
    just the unlet face of the moon when the
  • 00:01:20
    moon is between us and the sun that's a
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    new moon other times we'll see the moon
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    has moved around the earth and we see
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    the moon half illuminated and half dark
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    we'd call that first quar water at other
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    times still when the moon is moved
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    further around the earth we see the full
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    illuminated face of the Moon and we call
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    that full moon but it's just because the
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    Moon is half illuminated by the Sun and
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    it's our perspective on that half
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    illuminated Moon which gives the phases
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    why doesn't the Earth block the light
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    when we're seeing a full moon you know
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    if it's Sun Earth Moon why doesn't the
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    Earth block out the light so we can't
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    see the moon you would think that would
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    happen every full moon you would think
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    the Earth the moon would go through the
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    Earth's Shadow at every full moon but in
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    fact the moon's orbit is tilted slightly
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    to the orbit of the Earth around the Sun
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    how much is it tilted by about 5° so
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    virtually every Full Moon the Moon is
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    moving just above or just below the
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    Earth's Shadow I'm here with Andrew
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    Jacobs at the cydney observatory and
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    we've just witnessed a total lunar
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    eclipse so can you tell me what that is
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    so total lunar eclipse is when normally
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    there would be a full moon but the full
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    moon happens when the moon is in Earth's
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    Shadow so the Moon is passed through
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    Earth's shadow um it's gone through the
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    outer fainter part of the Shadow gone
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    into the inner darker part and turned
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    red so why does it look red when it's in
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    the middle of Earth Shadow ah there
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    three three effects here going on one is
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    that the Earth's atmosphere is
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    refracting the light into towards the
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    moon bit like a prism is it bit like a
  • 00:02:48
    prism yes exactly like that um it the
  • 00:02:52
    blue light however is being scattered
  • 00:02:54
    out by the Earth's atmosphere just like
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    a sunset you see a red sunset because
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    the blue light is scattered outwards um
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    so that leaves the red light
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    preferentially to get through to the
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    moon and then if there's dust perhaps
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    volcanic dust in the Earth's atmosphere
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    that dims the light so um leads to
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    either a brighter or darker red color on
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    the face of the moon what can we use the
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    lunar eclipse 4 why is it important to
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    us a few years ago I would have said it
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    was had no importance at all not much
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    importance anyway beautiful thing to
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    look at but not much scientific
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    importance but nowadays um we know that
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    there are planets orbiting around other
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    stars alien
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    ex exoplanets we call them and if we can
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    measure um the light that's going
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    through Earth's atmosphere and
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    reflecting off the Moon it can give us
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    an idea of what we might expect to see
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    if the light is coming through the
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    atmosphere of an exoplanet orbiting
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    around another star so we can use the
  • 00:03:52
    observations of a lunar eclipse around
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    the earth to infer what's what the
  • 00:03:57
    atmosphere of a exoplanet may be like we
  • 00:04:01
    can detect things like ozone or carbon
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    dioxide in Earth's atmosphere by looking
  • 00:04:05
    at the Spectrum that reflects off the
  • 00:04:07
    moon and if we see a similar Spectrum
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    when we look at a exoplanet around
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    another star we could infer there is um
  • 00:04:14
    ozone or carbon dioxide in that
  • 00:04:15
    atmosphere could you detect water vapor
  • 00:04:17
    as well you could detect water vapor as
  • 00:04:18
    well yes and that would obviously be a
  • 00:04:20
    pretty exciting sign if we saw that that
  • 00:04:22
    would be a very exciting sign yes yes
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    all those things together and perhaps a
  • 00:04:25
    methane as well might suggest that
  • 00:04:27
    there's life out there in the universe
  • 00:04:31
    what
Tags
  • moon phases
  • lunar eclipse
  • Earth
  • Sun
  • atmosphere
  • exoplanets
  • light
  • perspective
  • red moon
  • scientific importance