This cell might then enter a germinal center, located in lymphatic organs such as lymph nodes.

In this sentence, lymphatic means:

A. relating to the part of the skull that encloses the
brain
B. involving the metabolic process of breaking down
molecules of glucose
C. of or relating to or characterized by fever
D. of a fluid containing white blood cells or the system
that circulates it

that is wrong, its not thymus.

what bodys are there orbiting?

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.