Parsec definition | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy
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Parsec Definition. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/cepheid-variables/v/cepheid-variables-1?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/stellar-parallax-clarification?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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which software is used?
plese tell me -
this is awesome i like learning from Khan Academy more than I like learning in school.
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Astronomical Unit Converter, app that allows you convert quickly and reliably units such as:Redshift (z), Pársec (pc), Light-year, Astronomic unit (au), Light minutem, Second light etc
https://play.google.com/store/apps/details?id=com.anazco.juan.datosconverterunits&hl=en -
so it is not the distance btw Earth and the stat but stat and star?
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because the sun is losing its angular momentum, the distance between the sun and earth is growing ever so slightly. does this mean that the definition of the parsec is changing along with it?
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what is this software? thank you - great job :)
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though your LY-AU appears to be partially mistaken, the first degree of difference in the resulting calculation doesn't occur until the 6th decimal place. if 5 decimal places is good enough for nasa, then it's good enough for me.
although the difference of 0.000 003 lightyears is still quite a few times around the earth. personally i like the idea of using lux instead of light-nanosecond. it's far more succinct and sounds nice. it gives us "Nanolux", "Lux", "Decalux", light-second (6x decalux) and so on. -
is parsec named after some mathematician , scientist ,astro physicist ? . are the stars we see in the night sky suns or other galaxies . the black hole at the center of our galaxy why does;nt it consume us ? is it moving or stationary ? so even traveling at light speed one would not go out of the milky way ? thank you
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Thankz!! It helped a lot :)
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Nice explanation... Easily Understood. Thanks :)
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I named me ParSecs without knowing what it mean, but now i do thx a lot^^
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well fuck, i guess I should go and learn what a tangent is now lol
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woow , thanks man
its awesome -
i thought the word parsec was the name of a physicist . i also misunderstood the distance light travels in one year . qm;s said you would have to travel that speed to get out of our galaxy and nearby galaxies. thnkx for the update.
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Thanks a lot! Understood =)
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It's because it is an angle, which is less than 90 degrees. Would you ohave preffered 89 1/3600 degrees?
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If the distance from the object towards the sun is 4.2 lightyears, the distance from the object towards the earth is 4.2 lightyears too of course, so those few lightminutes really doesn't matter.
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have a test on wednesday.... I love you
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This guys is shit at explaining ! ... Confused me even more !
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Why is it the distance it needs to be from earth and not the distance it needs to be from the sun? with your cursor you highlighted the distance from the sun to the object and said earth so which one is right?
7m 34sLenght
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