Parallax in observing stars | Cosmology & Astronomy | Khan Academy
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Parallax in Observing Stars. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-parallax-tutorial/v/stellar-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/quasars/v/galactic-collisions?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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Okay, question: If the apparent magnitude is equal to the absolute magnitude, what would be the distance of the hypothetical star?
(Thanks for any help, I have a huge exam tomorrow and would appreciate input, as my astronomy professor is not the best in the world..) -
your sun is way too big and so far away from earth. orbit.??
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what is the point of this lecture when there is no parallax observed as measured within 6 months, ie when the triangle base is around 300 million kilometers? Nor after all the thousands of years of the Earths rotation and hurling through the space?
In order to explain the absence of the parallax, and yet still hold on to the helio-centric gospel, they "calculated" (by the stars brightness estimates (!??!)) that those fixed flickering lights we see on the night sky are in fact sun-like stars some zillion kilometers away.
yeah, I know, the parallax is still there, only not detectable, just like the tides in the lakes, right? -
There is supposed be be a Chandler's wobble every 443 days; and yet polaris maintains that very small arch, and never changes position night after night. The slightest wobble of earth's rotation would change the north celestial pole dramatically. We can therefore only conclude that there is no Chandler's wobble. Any insults?
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constellations have never changed their position from each other, ever. stars never change their celestial latitudes, ever.
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People's questions are not understanding that this is an exaggerated EXAMPLE just for the sake of understanding parallax. Made perfect sense to me.
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I don't quite understand your model, if you were standing at the same point at dawn looking straight up 6 months later, according to your model, you would be looking 180 degrees in the other direction, at completely different stars...
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Aaaah, see what target star "when the sun is just setting or just rising"? There are very few if any morning stars (other than Venus which is not a star). With the Sun just rising or just setting there is too much light from our star to see any other stars. I believe you mean to describe this method as just a mathematical exercise rather than an actual method...and perhaps with fancy telescopes at the tops of 'Andes' mountains this is possible
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umm you beat around the bush way to much that should only be a 4 minuet video for what you taught us
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I need an animated video to visualize it
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If a person on a planet near a distant star did this same measurement to find the distance they are from our star, would they get a similar result? If so would that work the same with age? Could two people across a span of the universe accurately measure the difference between the age of their star and the the others person's star by the light coming from them?
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How does one know when the plane of the Earth and the Sun is perpendicular to the star?
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I really dont understand how the angles in the main diagram are equal to the angles in the smaller diagram (looking up)
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What do you mean the two angles will be equal? ;/
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Could someone explain 3:28- 3:45 please? How is that angle the same as the other angle 180 degrees!?
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Khan 75% of the time in the beginnings of your vids i'm as lost as a fish in sand. But then slowly but surely it all makes sense!!
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THANK YOU SO MUCH! I have an earth science quiz tomorrow, so this was really helpful. YOU ARE THE BEST, NO JOKE!
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I think we should consider the speed of the stars, shouldn't we? Another problem is that we are stargazing the past because of the light time delay.
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Shouldn't it be between fall and spring, rather than summer and winter since the Earth orbits the sun in an ellipse?
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@khanacademy - Isn't the target star revolving around some orbit? In that case there would be a shift in the two angles measured. Or is it that since the target star is way too far from earth, the effect of revolution of the target star is neglected?
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