Astronomy is the study of

Astronomy is the study of celestial objects. In other words, the study of anything having to do with the things of outer space.

Explanation:

The word astronomy comes from a Greek word that means "star-arranging."

Astronomy is the study of the Universe

Explanation:

Hope this helps out

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.