Galaxies Part 2

The words "elliptical", "irregular" and "peculiar" are used to classify galaxies based on ___

• behavior

• shape

• location

• mass

In the 1960s, the peculiar object 3C273 was eventually determined to be ___

• an unassuming blue star

• a galaxy emitting radio waves

• a blue star emitting radio waves

• an unassuming galaxy

Compared to our Sun, how much more energy is blasted out by 3C273, the brightest quasar in the sky?

• 4 thousand times

• 4 million times

• 4 billion times

• 4 trillion times

Galaxies that emit x-rays and gamma rays were given the generic name ___

• EM emitters

• active galaxies

• XG blasters

• emission galaxies

What appears to be at the heart of every big galaxy we see?

• a pulsar

• a quasar

• a bar of blue stars

• a huge black hole

The flat disk of material that swirls around a black hole at ferocious speeds is called ___

• an accretion disk

• a spiral drain

• a whirling conduit

• an accumulation saucer

In which direction do active galaxies launch beams of matter and energy?

• in random directions

• along a single radius of the disc

• in the plane of the disk

• along the poles of the disk

If the poles of an active galaxy are aimed right at us, we see ___

• lots of infrared radiation

• lots of visible and ultraviolet light

• lots of radio waves

• lots of x-rays and gamma rays

A black hole, like the one in the Milky Way, that is not actively feeding is said to be ___

• impelling

• asleep

• quiescent

• progressive

One way to flip a quiescent black hole from a baby to a monster is through ___

• galactic collisions

• old age

• a dissipating accretion disk

• frictional forces