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There are free open source spreadsheet program alternatives for those who don't have m$ office, f.i. libreoffice calc

Are you still teaching?

Miss you professor 😁👍🏾

You must love Jehovah your God with all your heart and with all your soul and with all your mind and with all your strength. You must love your neighbor as yourself. Jesus the anointed is Lord! Repent and be baptized and believe the Gospel.

You must love Jehovah your God with all your heart and with all your soul and with all your mind and with all your strength. You must love your neighbor as yourself. Jesus the anointed is Lord! Repent and be baptized and believe the Gospel.

Awesome view. Thanks

WAZZUP

Thank you

We want to use this video for a college course in Astronomy at Santa Rosa Junior College. Would you please grant us permission to caption the video so it has punctuation and clear sentences? If you turn on Community Contributions in RUclips, we could add the better captions to these videos. Alternatively, we can send you a corrected caption file that you can upload in RUclips. One more option is to use a site such as Amara.org that will embed the video and give us an interface to overlay the video with the better caption file. All of these options leave the control in your hands. If you take down the video, it will no longer appear in the course, we will just be embedding from RUclips, not downloading the video.

what idiot called it a Type 2 Supernova and not a Twopernova

Well presented

Thanks sir you're awesomesome i had been trying to understand this for a week but now I have reached my destination..thanks a lot sir 👍👍👍👏👏👏👏👏👏🙏🙏🙏

This video is awesome. Thanks for helping me.

How do you measure that angle?

Great video! Very informative, thank you 👍

Came here for dark matter, got totally sidetracked in trying to understand how the spiral structures of any galaxy work (upon realizing a few seconds in that, of course, the galaxy does not rotate as if it were a solid pinwheel spinning).

We never see the stars change

Wow 5 years break, keep the good work up tho

Mind officially blown. 👍

Thank you so much for explaining this so I can comprehend all the information.

My thoughts : 🤔 Galaxy rotation curve is may be little bit due to distribution of gravitational time dilation in space from galactic center to us and from us to outer side of galaxy for our Galaxy and same for all galaxy's Because mass density in the center of galaxy is higher then middle ( where our earth is ) so time runs slower in center then middle , so stars only appears that it is moving slower relative to us . And for why we see outer stars of galaxy orbiting faster then it should be it is because time runs faster in less dense area of outer side of galaxy so that appears that they are moving faster relative to us . If it's wrong then why ???

This helped me so much thank you!

This makes so much sense to me now.

Thank you very much!

I think I have got it. Thank you!

thank you sir

Excellent tutorial. Got what I needed.

so a galaxy is actually not nearly as extreme as a vinyl record, because in that case the speed would constantly go up with distance. instead it seems to remain roughly the same. that's strange. are there measurements of objects far out, near the edge of the halo where the orbital speed starts to behave like in the solar system? the curves seem to suggest that it never goes down.

Last line is not visible

thank you, this makes more sense than a book explaining celestial sphere models.

Great video

You keep saying path of the sun, so you are not a believer of the heliocentric theory?

The light that we see today is no older than 13.7 billion years. We can’t see beyond this. What we do know is that the objects that emitted that light are now roughly 45 billion light years away due to expansion. I think the terminology is bad, everything we see is at most 13.7 billion years old, I would call that the observable universe. We know space has expanded to at least 45 billion light years, I would call that our cosmic horizon.

Think the biggest thing astronomers and scientists fail to make clear when talking Big Bang, is the Big Bang essentially happened everywhere all at once. Think BOOM, infinite (or at least theoretically) space. There is no single point to trace back to.

imperial units make me angry. Just join the world and let go of these piece of junk units would you ever do that Americans? my full respect and thanks for the informative video.

Even the speed of light has a incredible speed of 300,000km /sec it would be still slow to see it's speed if it will travel across our milky way galaxy which takes 100,000 light years accross..

Awesome...☆ thank you!

How come the north star never moves but the earth supposedly has a woble? The sun moves very far north in summer and far south for the winter. I don't get it.

so does the celestial sphere rotate opposite the earth?

15:59

This is the best and easiest to understand explanation of black body radiation I have come across on RUclips. Thank you for posting

Celestial/si-less-ti-uhl/adj 1. relating to heaven. 2. relating to the sky or outer space. derivatives celestially adv origin Latin caelum 'heavenly'

3:30 that is a cool galaxy xd

thank you sir

I thought to put a scale model - with the distance between the earth and the sun being roughly 100 million miles shrunk to 1mm. On such a scale the distance between one side of our Galaxy and the other would equate to the distance between London and Los Angeles. Every millimeter between London and LA representing a distance of 100 million miles. Its ridiculous !

Wow

ThAnk you!