An Astronomer Would Like to Study a Region of the Universe

question 22

Essay

An astronomer would like to study a region of the Universe 100 Mpc across and 1 Gpc away from Earth,situated behind an obscuring cloud of dust,so he or she cannot directly measure light from the region.How could he or she measure the mass contained in this region?

---

Definitions:

Vaginal Bleeding

Unusual bleeding from the vagina that can occur outside of normal menstrual periods due to various medical conditions.

Goodell Sign

An indicator of pregnancy characterized by the softening of the cervix and the vagina caused by increased vascular congestion.

Chadwick Sign

A bluish discoloration of the cervix, vagina, and labia resulting from increased blood flow, usually an early sign of pregnancy.