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 Lynn   Send message Joined: 20 Nov 00 Posts: 14162 Credit: 79,603,650 RAC: 123 
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Just a couple of black holes. |
moomin  Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0 
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Biggest explosion since Big BangWell, the Big Bang wasn't an explosion. Just an event in our universe that started to expand from the "beginning". Meaning the distances between objects are getting more far from each other. That expansion is still happening and in an accelerating rate as we know it. |
Sirius B   Send message Joined: 26 Dec 00 Posts: 24879 Credit: 3,081,182 RAC: 7 
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Sirius B Send message Joined: 26 Dec 00 Posts: 24879 Credit: 3,081,182 RAC: 7
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William Rothamel  Send message Joined: 25 Oct 06 Posts: 3756 Credit: 1,999,735 RAC: 4
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moo, Don't you think that IF the expansion were accelerating then that would imply the creation of energy. I don't think that this is happening at all. The concept that energy cannot be created or destroyed is rock solid in my mind. So if acceleration is true, this implies a multi-dimension configuration of reality in which the topology is causing the mass of our visible universe to fall into a type of gravity well which produces the acceleration. How and why do we think that the universe is expanding at an increasing rate or even that it is expanding ? This --I think- is based entirely on the doppler shift that we observe in the farthest galaxies. In my simple-minded way of thinking I remind myself that the farthest galaxies are showing us what was happening 13 Billion years ago when Gravity did not have enough time to slow the velocities produced by the Big Bang. Though I have taught Physics at the university level, I am sure that today's astronomers and cosmologists are more knowledgeable than I about this subject--Therefore, what is wrong with my thinking and why do they think the universe is still expanding at all let alone at an accelerating rate. One could look at the Andromeda Galaxy and say that we are contracting due to the "pull" of gravity. |
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Michael Watson Send message Joined: 7 Feb 08 Posts: 1385 Credit: 2,098,506 RAC: 5 |
As I understand it, the galaxies are retreating systematically at greater and greater velocities, at greater and greater distances. This suggests a universe-wide effect, not one confined to only the early universe. Apparently, the farther-away galaxies are retreating even faster than this simple trend would suggest, requiring something else to explain the addition expansion, hence dark energy. |
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moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0
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moo,I'm confused as anyone else. The concept that energy cannot be created or destroyed is rock solid in my mind as well. An expanding universe means that some energy would be added to make it happen though. Scientists are trying to explain it with Dark Energy. "Empty" space seems to have more properties than we could imagine. |
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William Rothamel Send message Joined: 25 Oct 06 Posts: 3756 Credit: 1,999,735 RAC: 4
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If the vacuum has energy then we should be able to demonstrate same with a simple spacewalk from the ISS. |
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moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0
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No. That it's not so easy and I don't see why ISS passengers should be able to recognize vacuum energy. There is no vacuum where they are. The problem is to understand why not energy is not "diluted" while space is expanding. Instead when universe expand the energy is also expanding. Where do that extra energy come from? Very weird if you ask me. |
Gary Charpentier    Send message Joined: 25 Dec 00 Posts: 30687 Credit: 53,134,872 RAC: 32
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The energy is not new or being created. It is coming from elsewhere. Elsewhere being one (or more) of the other 8 dimensions that are not part of what we call spacetime. |
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moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0
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Aha. The energy comes from elsewhere... Well that make sense. Or maybe not:) |
Dr Who Fan  Send message Joined: 8 Jan 01 Posts: 3230 Credit: 715,342 RAC: 4
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Today is International Astronomy Day! Established to promote astronomy to the general public, astronomy clubs and groups use this day to help teach the people about the stars and other celestial bodies in the universe. Be sure to mark your calendars for May 16 when the moon, Jupiter, and Venus line up to form a smiley face! |
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William Rothamel Send message Joined: 25 Oct 06 Posts: 3756 Credit: 1,999,735 RAC: 4
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Aha. The energy comes from elsewhere... If so, then that means that the universe, as we know it, is not a closed system. |
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moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0
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Apparently. But that would mean there are multiverses out there. Some scientists suggest it have to be such. Like "Mad Max" Tegmark and Laura Mersini-Houghton and some others.Aha. The energy comes from elsewhere...If so, then that means that the universe, as we know it, is not a closed system. |
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Sirius B Send message Joined: 26 Dec 00 Posts: 24879 Credit: 3,081,182 RAC: 7
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Sirius B Send message Joined: 26 Dec 00 Posts: 24879 Credit: 3,081,182 RAC: 7
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The study that produced this infrared image was led from the University of California at Berkeley. It was part of a joint programme of observations that involved Hubble and the Juno spacecraft that's currently orbiting the fifth planet from the Sun."Lucky" image of Jupiter |
Pierre A Renaud  Send message Joined: 3 Apr 99 Posts: 998 Credit: 9,101,544 RAC: 65 
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A 'Code' in Starlight Reflected Off Distant Planets Could Reveal if They're Habitable - DAVID NIELD, 23 MAY 2020 https://www.sciencealert.com/surface-reflections-of-starlight-on-distant-planets-could-reveal-which-ones-are-habitable    Apr 3, 1999 - May 3, 2020
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Sir Lazzy Ass Send message Joined: 6 Jul 00 Posts: 4 Credit: 419,829 RAC: 811
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https://en.wikipedia.org/wiki/The_Demon-Haunted_World Read Dr. Sagan too Ni! http://www.kwsnforum.com/ P.S. Sir Arthur Charles Clarke is a bad ass too ;) |
Bob DeWoody  Send message Joined: 9 May 10 Posts: 3387 Credit: 4,182,900 RAC: 10
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I watched the Science channel's Monday night programming about space topics this week and saw some new ideas about the nature of the universe. More and more they( the scientists they employ to enlighten us) are admitting that they don't really know as much about the universe as they used to think. One theory now popular is that the universe is much larger than previously estimated and that there are probably many more galaxies beyond our(their) ability to observe. Also as time goes by the galaxies at the edge of our ability to detect will most likely pass beyond our detection range and as the universe expands (over millions of years) fewer and fewer objects will remain viewable. This assumes that the expansion rate is increasing and continues forever. So that rules out ever being able to travel to the edge of the universe. (duuh). So, as far as human space travel is concerned we are most probably limited to the confines of our galaxy and more specifically our local region, say 10 to 20 LY from earth. This is my belief until or unless a way to bypass the speed of light is discovered by some far off descendant of mankind. Bob DeWoody My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events. |
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ML1 Send message Joined: 25 Nov 01 Posts: 20365 Credit: 7,508,002 RAC: 20 
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A big part of Science is to gain a better understanding so that you can better appreciate how much more there is that you have yet to appreciate. I'm not sure if it is Terry Pratchett or Douglas Adams or someone else lost in time and philosophy that coined a very apt phase to describe: "Pushing back further the event horizon of ignorance." Very apt in that we so far have no end in sight for how far we are expanding our ignorance out ever further ahead of our expanding bubble of understanding. Keep searchin'! Martin Edit: OK... So there is this quote from Henry Miller: "In expanding the field of knowledge we but increase the horizon of ignorance." See new freedom: Mageia Linux Take a look for yourself: Linux Format The Future is what We all make IT (GPLv3) |
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