What are the main general features that make clusters of stars useful to astronomers? a. the stars are at the same distance from earth, were formed at approximately the same time, and were made from the same chemical mix. b. the stars all have the same intrinsic brightness but differ in size and surface temperature. c. the stars all have the same apparent magnitude, the same surface temperatures, and the same sizes. d. the stars are all at the same distance from earth, have the same surface temperature, and joined the cluster at various times.

1/0.14nm = 10^10/1.4 a lot

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).