Dark Matter Less Influential in Galaxies in Early Universe

摘要

We see normal matter as brightly shining stars, glowing gas, and clouds of dust. But the more elusive dark matter does not emit, absorb, or reflect light and can only be observed via its gravitational effects. The presence of dark matter can explain why the outer parts of nearby spiral galaxies rotate more quickly than would be expected if only the normal matter that we can see directly were present.