Search found 298 matches
- Fri Oct 23, 2009 2:46 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Do we know what Dark Matter/Energy is?
- Replies: 101
- Views: 5487
Re: Do we know what Dark Matter/Energy is?
Interesting terms,.."refine and improve upon". Please note: I do not propose that a complete modification is required or that any specific modification will completely explain all observations. On the other hand, I strongly suspect that we will continue to "refine and improve upon&quo...
- Fri Oct 23, 2009 4:42 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Do we know what Dark Matter/Energy is?
- Replies: 101
- Views: 5487
Re: Do we know what Dark Matter/Energy is?
canuck100 wrote: Synopsis: Dark Energy Known? 70% of the universe is dark energy it is responsible for the acceleration of the expansion of the universe. Three kinds of theories attempt to explain it: 1. Einstein’s cosmological constant – i.e. vacuum energy, a property of space itself 2. a strange e...
- Thu Jun 25, 2009 3:27 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Water on Mercury
- Replies: 8
- Views: 1137
Re: Water on Mercury
We must collect a sample of this Mercury Ice.
- Thu Dec 18, 2008 11:11 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Speed of Light not Constant?
- Replies: 28
- Views: 2876
Re: Speed of Light not Constant?
I understand Chris. Thank you for your reversal and partial agreement. However, most scientific adventures are difficult and dependant upon luck. Some were near impossible with major odds stacked against them. But the quest for knowledge must prevail. ![Idea :idea:](./images/smilies/icon_idea.gif)
![Idea :idea:](./images/smilies/icon_idea.gif)
- Thu Dec 18, 2008 8:14 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Speed of Light not Constant?
- Replies: 28
- Views: 2876
Re: Speed of Light not Constant?
I think we are currently detecting about four GRB's per month? Chris, your reply appears to indicate that my original statement could be accurate? ![Shocked :shock:](./images/smilies/icon_eek.gif)
![Shocked :shock:](./images/smilies/icon_eek.gif)
- Thu Dec 18, 2008 1:34 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Speed of Light not Constant?
- Replies: 28
- Views: 2876
Re: Speed of Light not Constant?
I was thinking along the lines that GRB's are the most luminous electromagnetic events occurring in the universe..... The search continues for that perfect lens, with many multiply-imaged arcs. Gravitational lens, Wikipedia Perhaps I am confusing this process in my mind though. The light source is n...
- Tue Dec 16, 2008 11:28 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Speed of Light not Constant?
- Replies: 28
- Views: 2876
Re: Speed of Light not Constant?
It seems to me that observing GRB's in greater detail would eventually lead to more evidence for or against Dark Matter.
- Fri Nov 14, 2008 9:32 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
Re: Could Dark Matter Possibly Be . . .
Chris, Thank you for your timely response. I stand corrected. It appears that observation does support a metric expansion as you kindly stated. Very interesting. Back to the DM. As you already know, QM has identified the 3 messenger particles responsible for 3 of the 4 forces. Is it reasonable to th...
- Fri Nov 14, 2008 7:34 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
Re: Could Dark Matter Possibly Be . . .
I think it should be mentioned that it is only a theory that empty space is expanding. Observations clearly reveal that matter is moving and creating greater distances from other matter. However, the fabric of space itself -there is no direct evidence of it's expansion and this assumption is based m...
- Sat Nov 08, 2008 5:52 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
Re: Could Dark Matter Possibly Be . . .
Wow - I wasn't being sarcastic. Are there any theories on the origin of DM? Such as there is on Hydrogen and Helium. But I suppose we need to know what it is 1st, eh?
- Sat Nov 08, 2008 4:42 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
- Thu Nov 06, 2008 1:41 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
Re: Could Dark Matter Possibly Be . . .
Chris wrote: I don't understand your point about technological barriers. From a theoretical standpoint, DM is on stronger ground than DE (again, I don't know why these get discussed together, when there is absolutely nothing in common between them). Of course, their theory is still being developed, ...
- Wed Nov 05, 2008 1:12 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
Re: Could Dark Matter Possibly Be . . .
Chris wrote: Gravitons are completely hypothetical, and not even required by most theories of gravity. The physical existence of dimensions beyond the four we have evidence for is hypothetical and has no supporting observations. I noticed you did not attempt to answer my direct question but then aga...
- Tue Nov 04, 2008 11:18 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
Re: Could Dark Matter Possibly Be . . .
Could DM be a reaction/effect of gravitrons entering and passing thru our spacial dimension?
- Tue Nov 04, 2008 5:27 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
Re: Could Dark Matter Possibly Be . . .
Chris, I have been looking but I am unable to locate info on the M-Theory as it relates to DM & DE. Does Quantum Mechanics support these theories too?
- Tue Oct 28, 2008 2:15 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
- Tue Oct 21, 2008 4:48 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
- Tue Oct 14, 2008 6:37 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
Qev wrote: Just thought I'd point out, leptons, photons, W and Z bosons, and neutrinos are all non-baryonic matter. I do not think this is correct nor do I think it would be a good example. I do think that when I first suggested that we may have gravity wrong once again -goes unchallenged (with a pa...
- Wed Oct 08, 2008 11:10 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
- Tue Oct 07, 2008 10:19 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
- Mon Oct 06, 2008 12:35 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
- Sat Oct 04, 2008 3:47 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Could Dark Matter Possibly Be . . .
- Replies: 315
- Views: 27804
- Thu Sep 11, 2008 4:31 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Active Galaxy NGC 1275 (APOD 22 Aug 2008)
- Replies: 20
- Views: 7205
- Wed Sep 10, 2008 4:45 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Active Galaxy NGC 1275 (APOD 22 Aug 2008)
- Replies: 20
- Views: 7205
I agree it sounds like a movie. However, some ideas as ridiculous as they sound can become reality at a later date. So mock accordingly I just wanted Orin to realize that there could be alternatives and one may not have to find a way to reverse the entire observable universe to accomplish time trave...
- Fri Sep 05, 2008 10:21 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: Active Galaxy NGC 1275 (APOD 22 Aug 2008)
- Replies: 20
- Views: 7205
Orin wrote: One of the reasons i don't believe we can go backward in time. To do so; the movement of the universe would have to be reversed. If your at a certain place at a certen time; everything would have to be at that point. Unless the other unknown dimentions can allow this. Ronald L. Mallett, ...