What information about an astronomical object can be determined by observing its spectrum?

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

A( developed during the process of technology design

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little