- #1
BernieM
- 281
- 6
While pondering the concept of dark matter with my puny brain, I came to a question I was unable to answer which seems to have some significant implications:
Is Dark Matter affected by gravity and therefore clumped up with other matter in the universe? or is it unaffected by gravity and spread out homogenously throughout the universe?
It seems that either situation presents some further questions to be answered.
If Dark Matter is clumpy and clumps up in the same regions as normal matter, and our calculations of the gravitational effects of 'normal matter' were done without the influence of the knowledge of dark matter, then it seems that normal matter would have a much lesser gravitational effect than we have given it credit for and so would require even more dark matter to exist to create the gravitational effects we see.
If Dark Matter is NOT clumpy and is evenly distributed throughout the universe then normal matter would have to have a much stronger gravitational effect than we have given it credit for. In a scenario of our galaxy, the gravitational effect of dark matter would be helping to keep all the stars in the galaxy from flying off into intergalactic space, where the dark matter in the vicinity of the galaxy beyond the galactic edge would be attempting to pull those stars away from the galactic center with a greater net force than the dark matter within the galaxy was pulling them in.
Is Dark Matter affected by gravity and therefore clumped up with other matter in the universe? or is it unaffected by gravity and spread out homogenously throughout the universe?
It seems that either situation presents some further questions to be answered.
If Dark Matter is clumpy and clumps up in the same regions as normal matter, and our calculations of the gravitational effects of 'normal matter' were done without the influence of the knowledge of dark matter, then it seems that normal matter would have a much lesser gravitational effect than we have given it credit for and so would require even more dark matter to exist to create the gravitational effects we see.
If Dark Matter is NOT clumpy and is evenly distributed throughout the universe then normal matter would have to have a much stronger gravitational effect than we have given it credit for. In a scenario of our galaxy, the gravitational effect of dark matter would be helping to keep all the stars in the galaxy from flying off into intergalactic space, where the dark matter in the vicinity of the galaxy beyond the galactic edge would be attempting to pull those stars away from the galactic center with a greater net force than the dark matter within the galaxy was pulling them in.