Astronomers have been making maps by observing a slice of the universe and seeing where the galaxies lie within that slice. if the universe is isotropic and homogeneous, why do they need more than one slice? suppose they now want to make each slice extend farther into the universe. what do they need to do?

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

Organelles are 1. responsible for producing power for the cell 2. tiny structures in the cell that carry out the cell's activities 3. responsible for digestion in the cell 4. found outside of the membrane

The least penetrating form of radiation is