By Will Dunham WASHINGTON, Jan 26 (Reuters) - Using observations from the James Webb Space Telescope in a patch of the sky covering almost three times the area of the full moon, scientists have created the most detailed cosmic map to date of the mysterious substance called dark matter that accounts for most of the stuff that populates the universe.

Democrats ran into a setback on Tuesday in Virginia to fight back against President Donald Trump's congressional redistricting efforts, but they took a step forward in Maryland, though obstacles remain for enacting a new congressional map there.