The formula v2 = g is very useful for astronomers because it does not require them to know t. what does t stand for? orbital period tangential speed satellite radius

The right option is; orbital period

T stands for orbital period.  

Orbital period is the time a certain astronomical object such as planets takes to complete one orbit (360° revolution) around another object such as sun or stars. Orbital period is expressed in different units of time, usually in years, days or hours.

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.