Agalaxy cluster is a. another name for a star cluster. b. a group of stars that cluster just outside a galaxy. c. another name for the milky way. d. a group of galaxies bound together by gravity.

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.