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Category: Science
Date: 04/04/10 12:02 PM

39 Responses to Mars Loops The Loop

  1. Profile photo of rubrepublic
    rubrepublic Female 30-39
    10 posts
    April 4, 2010 at 8:33 am
    Link: Mars Loops The Loop - The ancients once believed we were at the centre of the universe but this clip reveals how that idea was debunked
  2. Profile photo of wko
    wko Male 18-29
    554 posts
    April 4, 2010 at 12:20 pm
    it all makes sense now =O
  3. Profile photo of Angilion
    Angilion Male 40-49
    12390 posts
    April 4, 2010 at 12:21 pm
    It`s a good series in general and Professor Brian Cox is just the job for presenting science programs in a way that has broad appeal and is educational.
  4. Profile photo of dotrom
    dotrom Female 18-29
    93 posts
    April 4, 2010 at 12:38 pm
    I feel smarter now.
  5. Profile photo of cobrakiller
    cobrakiller Male 18-29
    7426 posts
    April 4, 2010 at 12:43 pm
    and it took us many, many years to figure that out.
  6. Profile photo of ScottSerious
    ScottSerious Male 18-29
    5316 posts
    April 4, 2010 at 12:51 pm
    it`s funny this is up here, because just a week ago i had an astronomy test and this was one of the short answer questions. i got 5/5 pts. :-)

    stoopid Ptolemy and his epicycles.
  7. Profile photo of gingernut333
    gingernut333 Female 18-29
    1071 posts
    April 4, 2010 at 12:53 pm
    Clever video, thanks =)
  8. Profile photo of Rick_S
    Rick_S Male 40-49
    3275 posts
    April 4, 2010 at 1:17 pm
    I realize that this took us years to figure out, but the way he presents it like it`s new science. "The key thing is that the Earth is NOT at the center of the Solar System." If you have a TV, you should know this, really.
  9. Profile photo of duffytoler
    duffytoler Male 40-49
    5196 posts
    April 4, 2010 at 1:18 pm
    Earth not at the center of the solar system? Dammit, IAB, I wish you would quit baiting religious types.
  10. Profile photo of StarDagger
    StarDagger Male 40-49
    1189 posts
    April 4, 2010 at 1:40 pm
    Please tell me I am not the only one who learned this in junior high school?!?!
  11. Profile photo of auburnjunky
    auburnjunky Male 30-39
    10339 posts
    April 4, 2010 at 1:45 pm
    Duffy. That`s not religion. That`s old crappy astrology.
  12. Profile photo of Fatninja01
    Fatninja01 Male 30-39
    25408 posts
    April 4, 2010 at 1:51 pm
    Cool makes total sense! didnt really care to much about it but still cool!
  13. Profile photo of braindamaged
    braindamaged Male 18-29
    102 posts
    April 4, 2010 at 2:12 pm
    Easy... whatever dude. Wasn`t so easy 500 years ago.
  14. Profile photo of xiquiripat
    xiquiripat Male 18-29
    2423 posts
    April 4, 2010 at 2:33 pm
    "stoopid Ptolemy and his epicycles"

    Ptolemy`s theory lasted 2000 years because it worked like a peach. The only problem was the complexity of the mathematics. Copernicus` theory wasn`t much better because he kept all the epicycles and retrograde motions. In fact, on strict scientific grounds available at the time it was probably worse than Ptolemy`s (that dammed parallax) and he was forced to argue from aethetics. He was still obsessed with the idea of perfect circles. It wasn`t until Kepler that we got a theory of celestial mechanics that was both useful and simple.
  15. Profile photo of RecycleElf
    RecycleElf Male 18-29
    3622 posts
    April 4, 2010 at 3:09 pm
    i never thought about that...
  16. Profile photo of OldOllie
    OldOllie Male 60-69
    15844 posts
    April 4, 2010 at 4:47 pm
    Yeah, what xiquiripat said.

    This was correct in theory, but the geometry was off quite a bit. The retrograde motion starts BEFORE Earth overtakes Mars; it reaches its fastest apparent backward motion when the planets align with the sun (opposition), and it resumes its forward motion long before he shows in the video.

    One fact that he didn`t mention that would have made the explanation much more clear is that the Earth travels faster along its orbit than Mars does (29.78km/s for Earth vs. 24.13km/s for Mars, mean orbital velocity). This is why when we pass on the inside, Mars appears to be moving backwards against the distant background stars.
  17. Profile photo of Nidonemo
    Nidonemo Male 18-29
    9311 posts
    April 4, 2010 at 6:12 pm
    "If you have a TV, you should know this, really."

    I only watched Animal Planet and Cartoon Network when I had a TV. I`m not stupid, I just enjoy positive programming that pertains to my interests.
    ( ._.)
  18. Profile photo of Mornaf
    Mornaf Male 18-29
    820 posts
    April 4, 2010 at 6:22 pm
    For a guy with a burnt stick and some rocks, a fairly good job.
  19. Profile photo of CrakrJak
    CrakrJak Male 40-49
    17515 posts
    April 4, 2010 at 6:28 pm
    These observations are what began calculus. The mathematics involved in calculating just how and when these loops would occur was originally very complex, Especially when you also have to factor in the earth`s tilt and elliptical orbit.
  20. Profile photo of magoo22
    magoo22 Male 30-39
    660 posts
    April 4, 2010 at 8:13 pm
    For those IAB`ers under 40, the presenter Brian Cox once played keyboards for English new wave band "D Ream". He`s currently working experiments using the Large Hadron Super Collider in Switzerland.
  21. Profile photo of sourkrauter
    sourkrauter Male 18-29
    895 posts
    April 4, 2010 at 9:27 pm
    that was cool
  22. Profile photo of idiotfilter
    idiotfilter Male 18-29
    3916 posts
    April 4, 2010 at 11:31 pm
    was i the only one that already knew this? this just seemed boring and obvious....but i guess not everybody took an astronomy class 5 months ago...=D
  23. Profile photo of Angilion
    Angilion Male 40-49
    12390 posts
    April 4, 2010 at 11:32 pm
    For those IAB`ers under 40, the presenter Brian Cox once played keyboards for English new wave band "D Ream". He`s currently working experiments using the Large Hadron Super Collider in Switzerland.

    In case anyone gets the wrong impression from the above (which is true), he`s a bona fide physicist. He`s a professor at the University of Manchester and specialises in particle physics.

    He played keyboards for the then-unknown band D Ream when he was a student, like lots of students who play in unknown bands. What was different was that they had a massive hit ("Things can only get better"). He`d finish lectures and then go off to play live in front of 50,000 people. That must have been an odd contrast.

    Each episode has viewing figures over 5 million. Pretty impressive for a science documentary series in a country of 61m people.

    He`s also co-authored a book, "Why Does E=mc^2?", which explains relativity
  24. Profile photo of Baalthazaq
    Baalthazaq Male 18-29
    4548 posts
    April 5, 2010 at 1:35 am
    I think Rick meant that the Earth not being the center of the universe should be known by everyone, not that Mars has a retrograde motion from an Earthly perspective caused by a combination of the delta in velocity and the circumference of the differing orbits.

    Either way, this site has a 13-17 age bracket as a fairly big part of the community. I doubt most 13 year olds know this already.
  25. Profile photo of xxPinkxx
    xxPinkxx Female 18-29
    3830 posts
    April 5, 2010 at 1:54 am
    Ya it does seem obvious, but i still interesting i guess. and it DOES prove were not the center of the universe.Interesting to know how the ancients found that out.
  26. Profile photo of APJ311
    APJ311 Male 13-17
    749 posts
    April 5, 2010 at 4:11 am
    We watched this in Physics class just before the holidays.
  27. Profile photo of tainteddeity
    tainteddeity Male 18-29
    848 posts
    April 5, 2010 at 8:07 am
    Theory says there isn`t a centre of the universe.
  28. Profile photo of bored-am-I
    bored-am-I Male 30-39
    785 posts
    April 5, 2010 at 8:30 am
    I thought Mars was a chocolate...hmmm
  29. Profile photo of shappy
    shappy Male 18-29
    757 posts
    April 5, 2010 at 9:40 am
    and grass is still green...
  30. Profile photo of peloos12
    peloos12 Male 18-29
    3825 posts
    April 5, 2010 at 2:28 pm
    I`m with Pink on this one. The point isn`t the ZOMGGROUNDBREAKINGREVELATION that the Earth isn`t the center of the universe. It`s simply demonstrating how they figured this out using only far less advanced technology and sheer logic.
  31. Profile photo of MrTwidget
    MrTwidget Male 30-39
    795 posts
    April 5, 2010 at 3:27 pm
    Tried viewing the BBC channel on YouTube for more videos like this and it states: This channel is not available in your country. wtf?
  32. Profile photo of polkafromny
    polkafromny Female 18-29
    376 posts
    April 5, 2010 at 3:29 pm
    that`s pretty cool ^_^
  33. Profile photo of pantelisk
    pantelisk Male 13-17
    112 posts
    April 5, 2010 at 3:56 pm
    "Tried viewing the BBC channel on YouTube for more videos like this and it states: This channel is not available in your country. wtf?"

    Haha, no good programming for you. lucky im in the uk and can enjoy the bbc any time
  34. Profile photo of Angilion
    Angilion Male 40-49
    12390 posts
    April 5, 2010 at 6:47 pm
    Tried viewing the BBC channel on YouTube for more videos like this and it states: This channel is not available in your country. wtf?

    The BBC is a socialised TV organisation, paid for by taxes in the UK. So it`s not legally available for free outside the UK and the BBC has an obligation to UK taxpayers to uphold that. Some stuff gets ripped off, some doesn`t.
  35. Profile photo of bomberouno
    bomberouno Male 18-29
    185 posts
    April 5, 2010 at 7:38 pm
    peloos12,

    please dont use logic on this forum, many members take offense to such a thing.
  36. Profile photo of OldOllie
    OldOllie Male 60-69
    15844 posts
    April 6, 2010 at 9:30 am
    tainteddeity "Theory says there isn`t a centre of the universe."

    Actually, the Universe may or may not have a center, but the OBSERVABLE Universe does have a center: it`s at the location of the observer. If anyone asks you the location of the center of the Universe, you can answer truthfully and correctly, "It`s right here."
  37. Profile photo of trelina
    trelina Female 18-29
    249 posts
    April 6, 2010 at 3:56 pm
    They couldn`t get this guy a chalk board?
  38. Profile photo of GirlieMutant
    GirlieMutant Female 18-29
    236 posts
    April 7, 2010 at 10:59 am
    Finally something that I can watch that America can`t!! WOOOOO!
    (yes, I`m am tired of getting "This service is only provided for the US")
    SUCK IT!!

  39. Profile photo of shizzamX
    shizzamX Female 18-29
    2697 posts
    April 7, 2010 at 3:02 pm
    the rock he used to represent the sun is awesome

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