Stellar parallax | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
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Another version of the stellar parallax introduction. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-parallax-tutorial/v/stellar-distance-using-parallax?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-parallax-tutorial/v/parallax-in-observing-stars?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Comments
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how come i cannot observe stellar parallax? neither with my naked eye, my binos or watching star time-lapse videos reveals any stellar parallax why is this??? stars are watching
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your prospective loses about 3 months on each side. I don't like you
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What exact instruments are used to detect theta??
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Why do the moon and stars move together with no stellar parallax? Why does the moon give a cooling light?
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Nice video, I'm trying to this one out...if the galaxy is moving 1.3million mph, and our solar system is orbiting around the center of the MWG at 45k mph, how is it that we see the same star formations throughout history? don't these other stars move at all? maybe I'm just a dummy but it doesn't make sense to me.
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Your video was so good that at a 1:20 i was already thinking of how one could use dimensional analysis along with an object who's size and distance from the observer are known to calculate the size of something else much farther away. Let's see if I'm right. continues watching video
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very useful for GCSE revision
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At 3:40 "right at dawn" (with our star) "what would that star look like?" (the target star). You know why the planet Venus is dubbed the "Morning Star"? ANS: because the ancients at one time must have thought is was a star (really a wandering star)...because it stayed around the longest when the dawn light 'extinguished' all the other stars. So how ya going to see this target star in the light of the rising Sun or the setting Sun? Ya got to use time a bit more accurately by letting it allow one to take the angle measurement in the darker night (perhaps midnight of the target 'day' 6 months). apart
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How do you know when you should start measuring, how do you know when the star, the sun and your position on earth forms an exact 90° angle if you don't know the distance to the star?
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0:48 "As you shit"
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Is this a coding tutorial? LAWL
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The angle measurement is often measured relative to distant stars/galaxies, for example if you are looking at a "near" star you would measure its parallax angle relative to that of a "very far" star which you would approximate to have a zero parallax change as the Earth orbits due to the distance between Earth and the far star being much greater than that of Earth and the near star. Useless fact: The astronomical distance "parsec" is the distance (x) at which the parallax is 1 arc-second.
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1 person wants to live in a cave.
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When he said 'to the west' at 5:36 did he mean to the east?
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"This idea as you shi...t.. as you change..."
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Your videos are really cool and educational. As a visual learner I really learn a lot from the style of your vids. :)
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Had to watch it a couple of times but I think I get it. I can always count on this guy for math help.
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you can always skip the first 4 minutes of the video if you watched the previous one
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the only video so far that I got lost in.
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@fosheimdet "theta" greek letter often used to name an angle (like alpha beta etc.)
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