How Far Away Is It - 03 - The Solar System (1080p)
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Text at http://howfarawayisit.com/documents/ See 2014 update for Comets and Oort Cloud: https://youtu.be/MXYan2wA6io In this segment of our "How far away is it" video book, we cover distances inside our Solar System. We start out with a brief history beginning with how Nicolas Copernicus used planetary retrograde motion to help move us from the Earth-centric view to the Sun-centric view of our Solar System. We work our way through the contributions made by: Tycho Brahe and his detailed observations made with mural quadrants and sextants; Kepler and his mathematics of elliptical orbits; and Galileo and his observations using the newly invented telescope. We conclude this history with Newton and his theory of gravity. Gravity gives us the first opportunity to explain the inverse square law that will play such a central role in celestial distant measurements as we move out to the stars. We then explain planetary parallax as an extension to triangulation and use it to determine the distance to the Moon. We also illustrate all the additional information that becomes available once the distance is known, such as diameter, area and volume. Next, we take a look at the surface of Mars, the orbit of Mars and the Earth and the distance of Mars from the Sun, followed by distances of all the planets and Pluto from the Sun. We then focus on Jupiter to gain a feel for its size. We watch the comet Shoemaker Levy collide with Jupiter. We explain Lagrange Points and cover Jupiter's Trojan and Greek asteroids orbiting two of these points. This takes us to Earth's Trojan asteroid, 2010 TK7. Then, after covering the Kuiper Belt, we turn our attention to the Sun. We triangulate the Sun with Venus to calculate our distance from the Sun -- one Astronomical Unit. With distance to the Sun known, we calculate its diameter, surface area and volume; the length of Earth's orbit; the Earth's velocity around the Sun; and with that, the Sun's mass. Next, we use Jupiter's moon Io to calculate the speed of light and with that we calculate how long it takes the Sun's light to reach the Earth. We end with adding the parallax rung to our distance ladder. STEM
Comments
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We should all sign a petition into NASA to change the name of Uranus to something else. it always gets picked on. Who's with me? David Butler?
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Thank you!
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Is it pronounced YOUR ANUS (Uranus)? Great video by the way. Love this stuff.
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i like your narration - it has a kind of soothing quality - so does the background music .
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people who ruin this planet disliked this video
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nicely done. good narration speed, clear math, and you build on previous knowledge to get a complete picture. bravo.
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The Earth does not weigh anything, it's floating in space, there is no gravity in space, therefore our planet is weightless
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+David Butler Would not 6,600,000,000,000,000,000,000 actually be 6 million 600 thousand trillion rather than the 6 billion 600 thousand trillion you said in the video?
BTW I am loving the video book, it has refreshed my memory of so many forgotten mathematical equations. Thank you. -
Uranus is so far. yay.
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I just got sticked to your video without making any skip. Very interesting, useful, complicated things are easily answered by this video. Thank u very much sir
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Aaaaaaaaand you got a new subscriber.
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I love this guy. Great narrator and storyteller
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does anyone now the song at 7:50?
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background music
is too beautiful, i totally lost what you are saying -
WHAT CAN YOU TELL US ABOUT THE GAS DUST CLOUD WE ARE IN AND ARE MOVING OUT OF.....HOW LONG TILL WE ARE OUT, AND WHAT EFFECT WILL THE LOWER PRESSURE HAVE ON EARTH BY WAY OF LETTING THE SUN PROJECT OUT WITH MORE ENERGY
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David, here is a question. It's about Mercury. I'm convinced it did not form where it orbits today. Using the laws of physics and the examples of how Jupiter in the past tore apart bodies that now orbit in the Asteroid belt. It seems gravitationally impossible for a planetary body to form that close to the much larger Sun during the early stage of our solar system. The Suns gravity would of tore it apart. I've talked with professors about this and have been trying to do the math to prove it. I'm convinced Mercury was the end result of a collision with another body and pulled inward by the Sun "after" it was a fully developed planet. Maybe it was a moon of Venus? We hear theories that Mercury was "Larger" at one time and has now melted down to just an iron core with a crust. Its elliptical orbit is different than the other bodies. Also, I've read that its orbit is actually decaying inward and that Mercury will be swallowed up by the Sun "Before" it gets to its Red Giant phase. What's your take on this? Can math and physics prove Mercury was not formed that close to the early stage larger Sun? Also, do you agree with Planet Migration theory? I'm a believer in it.
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dang this is a great presentation, very well done
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whats the name of the song at 8 minutes? plz
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is that stan lee?
19m 24sLenght
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