Astronomy Lecture

[navidsonpuzzle]

Thank you for putting these up! Where are these lectures from? I wish more astronomy lectures were online and freely available, similar to all the other subjects available from fx. MIT. <3

[jameywcll]

attn drdave: i heard your guitar and it was not bad i love your lectures and probably because

of you i have a new interest in becoming a richard dawkins kind of guy.

what would i do to become a person that would explain things of this sort to ordinary people. is the dna of chemosynthesis related to photosynthesis btw.

i have searched on this and not found a good reply.

is this a profession? also check out my pickin its all ad lib like what you seem to be doing search jameywcll

humility first

[glowingdarkmatter25]

I don't use the microwave for food, but for experiments. :0)

[TheSupatrader]

the reason people in their majority are certain "we" went to the moon and back is because they are being told, matterfactly, that it is a fact - just like this guy in the beginning of the lecture. however, any ORP who looks into it will conclude that it is impossible to fly a man to the moon and back "in one piece" with the current state of technological affairs, if only due to the existence of VanAllen belts.

[doctordave]

@TheSupatrader "Conspiracy Theory" is the antithesis of scientific thinking - where the ABSENCE of evidence is what counts as evidence. The thinking of conspiracy theorists is logically backwards and constructed in such a way that makes intelligent argument impossible. Why don't you go off and play with the Holocaust deniers and the "US blew up the World Trade Center" loonies.

[iz2sicc]

@TheSupatrader Reading this comment just made me dumber :/

[StrikaAmaru]

Video starts at 1:30.

[TheSenuseret]

@TheSupatrader You know how WE are certain that we went to the moon ? that the USA put a man on the moon ? Because our big rival, the URSS gave us the credits and and said in public they recognized the feat. They knew they were defeated. That's enough for me. So next time, don't be so low mind person.

[DeadStarsShine]

Is a quasar a cluster of stars or just a black hole at the center of the galaxy? What is in the center?

[TheSupatrader]

@DeadStarsShine lol. neither. quasar is a type of a star, not as massive as the smallest BH, and it is not a cluster of stars. in the center of most, if not all old galaxies is a supermassive BH.

[doctordave]

@TheSupatrader A quasar is by no means "a type of star"!! It is believed to be some early stage in the formation of galaxies when the black holes in the center were accreting mass at a much faster rate than they are now.

You people have heard of a thing called "Wikipedia", right?? :)

[StrikaAmaru]

@TheSupatrader A quasar IS a supermassive black hole, located in the center of a galaxy; the difference between a quasar and what's sitting 60,000 light-years from us is that ours has long stopped feeding on surrounding gas.

Fun tidbit: quasar = QUASi-stellAR object. Just FYI.

[doctordave]

A few people have commented on this - I try to always say "all the DISTANT galaxies are all red-shifted" rather than "all the galaxies" . The distinction is necessary because within any gravitationally-bound system, space actually DOES NOT expand. Andromeda and the MIlky Way are part of a gravitationally bound system of galaxies called the Local Group, and these nearby galaxies are not moving away, they are just all orbiting the center of mass of the system.

[audreyfischer]

I understand that while most galaxies are red-shifted, Andromeda is blue-shifted because we are on a collision course. Does this imply that Andromeda is moving faster toward us than we are toward Andromeda? Is this a mutual gravitational tug? Is this nature's way of survival in masses? Couldn't two galaxies successfully merge resulting in a larger, energized galaxy better capable of resisting the tug of a black hole, likely the universe's top predator, and escape being eaten alive?

[21Italiana]

awesome lecture thanks for the lecture i have a astronomy final monday and have learned a damn thing in the class and this hour video has made me learn a semester worth the info thanks ! awesome teacher !!

[19RedLineR74]

Colour and Temp. When I heat steels with a welding torch, they all go cherry red and orange and yellow etc. But I haven't seen aluminium do it or lead? Do I just need more heat, or is it something else?

[doctordave]

@19RedLineR74 Not sure about LEAD, but if you check out a table of specific heats, AL is about TWICE that of steel... which means it takes twice as much "heating" to get aluminum to the same TEMPERATURE as steel. So my guess is, the blow torch isn't heating it fast enough relative to the rate that it cools in air.

[Agnotio]

The lecture starts at 1:29

[DeadStarsShine]

@Agnotio 27:00 " if it fucks around with your DNA" that was epic.

[Maartenn100]

Thank you very much for this great lecture. I understand a lot more about astronomy then before.

[NickSinits]

Thanks a lot! It was really new and interesting thing about mass measuring and some others.

But it seems there's a mistake. That very M-31 you've taken as an example for red shift, as I know, is actually the most famous blue-shifted galaxy. And there's a list of other extragalactic blue-shifted objects, apparently more than 7000

I can't post exact link for it's too long

[BARCACROSSESTHEALPS]

Great upload, thanks!

[saultube44]

Thanks for the lesson man, eloquently and simply explained

[contrastively]

I, too, like many others am beginning to get more interested in astronomy. So thank you very much for this video!

[BigCatsWildlife]

I am getting into astronomy and I am cramming anything and everything astronomy related into my head and your lessens are AWESOME! Please keep up the great work, Thank You.

[muzammilali007]

The wavelength of visible light is 380-720 nanometers and the radius of hydrogen atom is 53 picometers i.e the wavelength of visible light is a 1000 times greater that's why we can't see an atom. Visible light and all that falls below the visible spectrum are Non Ionizing Radiation, they don't cause cancer. Domestic microwave ovens operate at 2450Mhz and use more than a 1000 Watts, where as cell phones operate in a band of 2450Mhz and use only a few Watts, that's why they don't fry our brain.

[muzammilali007]

The reason a light bulb glows is a microwave is is not because the microwaves are knocking off electrons out of the filament but because that electric current starts to flow through it. that's the reason why we don't put any metallic object in the microwave oven. and finally microwaved objects can't be used as weapons as these objects couldn't possibly give off radiation of that high intensity and not to mention that it's non ionizing radiation.

[xkrystalclear]

Where was this taken?

[tonyswarstuffdotcom]

thanks for posting these videos

[AnaTipton]

I have been calculating the par secs since I saw this video a month ago, I observe easily now in the am hours. This technique is truly awesome and effective. Very simple ,understandable and applicable to the naked eye ,its true .

[KutasusWielgus]

i cant wait for THE ANSWER!!! lets take zyankali!

[JollSSteR]

can someone give me more info about how to super freeze?

it sounds cool, but i didnt really understand how to do it .P

[tonyswarstuffdotcom]

@JollSSteR yeah just lower the temp below freezing then shake the liquid t freezes

[JollSSteR]

@tonyswarstuffdotcom Thanx Tony, ill try it out ^^

[tonyswarstuffdotcom]

@JollSSteR the temp in ur freezer should be below 32 degrees so use a plastic container with a cap dont fill all the way but keep watching it dont let it get solid. then shake it and ice will form

[AnaTipton]

I going back UC Berkeley and this is really helpful in a tremendous way for my personal studies.He has a very sexy voice...

[AnaTipton]

I going back UC Berkeley and this is really helpful in a tremendous way for my personal studies.

[humpherykynaston]

The Horizon craft is due to reach pluto in 2015.

[ytertyu]

one of the best on the tube !

[iowdave]

I love these. Thank you from the south UK!

[sunnyastronaut]

your a genius. i did my physics exam last week but i wish i watched this before- i learned so much.

[blueishmonkey1]

What do you know, there's a religious debate going on.

[Hiibashiri]

that was so amazing...

i actually could hear him loud and clear...

OHHHH KEEP EM COMIINGGGG

[edithsakura]

that was awesome! thanks for the free lecture ^_^

[reboothater]

yes god created a universe so deadly to man and so vast, that man will not ever set foot on 98% of it, even if man could travel at the speed of light. that sure does help support the bible. lmao. stupid fundies.

[montanasosa21]

are u against or for the Bible?

[johntweak]

Very informative. Especially about light absorption and emission.

[Pig560]

wheres the video

[TenethUnited]

Jesus is Awesome !

He's the ultimate astronomer .

He made everything.

[jeffkrof]

@TenethUnited Actually God created it, and Jesus was his mortal son...Also..you know that JESUS isn't real , correct? :')

[xp0nd3r]

man i cant wait till i can start my and astronomy classes :(... still a freshman but i have like 3 notebooks full of notes on internet lectures and i have a pretty crazy telescope i use all the time.. damn these basic courses!!

[conjering]

Good luck don't quit, I always wanted to be an astronaut but I became a Firefighter/Paramedic instead.

[adrinalgland]

to conjering:

firefighters r the bravest!!

:)

[itrainsinoctober]

At around 1 hour into the lecture you say miles per hour? referring to light speed.

[theblackcomp111]

no its physics AND astronomy....You cant specialize in astro till you have a physics background

[LogInForPaper]

i'll be taking physics with astronomy and space science in uni soon, can't wait

[master1140]

Hey, I'm planning on taking a Physics/Astrophysics/Astronomy course at Uni as well..but next year:P Just wondering because I STILL don't quite understand the way the wording works...with the course "Physics with Astronomy", which of the two subjects is primarily under study? If it were "Physics and Astronomy", then both subjects would be balanced 50/50 but I'm still not quite sure about "subject #1 with subject #2".

[marshja56]

Since the first word in the course name is Physics this is a physics course that also includes some astronomy. Think of it as being called "Physics with (some) Astronomy."

[master1140]

I've found that the name can be misleading from time to time. I agree partly with what you say, "Physics with (some) Astronomy" but also it could be the opposite way around. Still "Physics with Astronomy" but Astronomy being the main bulk of the 3-4 year course. "(some) Physics with Astronomy", it can be confusing sometimes but all you really have to do is check out the course structure and that modules that the University teaches under that course name to really identify what they will teach.

[InvaderTaizic]

I wanna go back to school...

[berryjinin]

just starting school and im taking astronomy this semester

[hereandnow6002]

ASTRONOMY 101 or what?

[berryjinin]

ASTR101 yeah

[Steven197981]

Astronomy is a very interesting subject in science. I love talking about it to people who are interested in learning something, anything about it. I can talk for hours and hours about it.

[AdvancedGentleman]

Shit, I would much rather sit through this than my astro class. My prof likes to ramble on a powerpoint for 3 hours and then expects us to reiterate everything on the test.

[Forestsarecool]

explained a lot of terms that are thrown around that i never new what they were. good.

the ice cream man is bookin' it at 30 miles per hour hahaha

[jfriday1991]

Amazing lecture, I wish I could see his hand gestures though.

Thanks a lot for these videos, keep them coming!

[nim1mx]

nice video..thanks for posting

[diggerman40]

i enjoyed this lecture very much ,bought back memories of being at school "SOMETIMES" drifting back i remember my best mate would be trying to make fart noises from his arm pit .

[wildreams]

You can always go back to school, take a class or something, experience getting drilled again:)

[maxpolaris99]

Post more lectures! Viva Open Course Warez

[soonerufo]

Great lecture thanks for sharing

[alexviseu]

I loved this lecture. Very good one, I could hear this for hours. Great orator!

Thanks for posting. :)

[Fenceman000]

Nice lecture, the only critisism of the vid is - it could do with a few more illustrations.

[sevenlukechilders]

i am well informed thank you for the lecture answered alot of my questions

[SsaraSstar]

Dude, you rock! Thanks for the free education!!

[galaad33]

great lecture, thanks !

[jleack]

GREAT video. Thanks for this. I love astronomy.

[ozzmandozz]

who is this guy?

The universe really fasinates me, I'de like to know where he teaches so I can sign up to his classes!

[jmaley3]

I wish more professors did this. :)

[FOREMANROCKYCOINS]

this is a great lecture

[inhouseshank]

Better than spending money and going to school

[j055w4]

I hear that, more lectures posted please!

[twq1976]

this doctor should get an award for explaining complicated matters into plain english,im not a smart person myself but i am a good listener and therefore i understood at least 85 procent of this the 1st time.shows you that its not what you say,but how you say it.

[xcepshun]

Awesome lectures, i listen to them before bed.. very soothing and very informative.. love it!

[JPDaniel]

Great! Thanks for putting up this lecture. I'm considering taking physics and astonomy at the University of Stockholm.