To verify whether an object truly classifies as a massive black hole, astronomers need to determine how quickly stars and other debris orbit around the center of these objects. These measurements, which need to be taken at 10 different adjacent locations within a relatively small area, help determine how much mass is concentrated in the center. If there is more mass than can be accounted for by stars alone, the mass must be locked away in something very compact-a black hole. Given STIS's dramatically enhanced data-gathering capabilities, scientists will be able not only to locate supermassive black holes, but begin to discern differences in their characteristics. Stellar Flares .
Flares are powerful explosions on the surfaces of many stars.
When our own Sun flares, the episodes frequently disrupt communications, create power line surges and threaten space travelers. Astronomers don't understand the physics behind such violent eruptions, but by studying the events on other stars, they will begin to unlock some of their physical secrets. Evolution of the universe. This information indicates how much mass the universe contains. Knowing the mass of the universe will help astronomers determine whether the universe will continue to expand forever or will ultimately stop expanding and begin to collapse.