Discuss the observational differences between spiral, elliptical, ...

[elizabeth18]

Discuss the observational differences between spiral, elliptical, and irregular galaxies.
 
  What will be an ideal response?

Question 2

The helium flash is the cause of some supernovae.
 
  a. True
  b. False
  Indicate whether the statement is true or false

[sultana.d]

Answer to Question 1

Elliptical galaxies (class E) have no disk, no spiral arms, and almost no gas and dust. They range from huge giants to small dwarfs. Spiral galaxies (class S) are disk-shaped and usually have spiral arms and contain gas and dust. Some of these have a central region shaped like an elongated bar and are called barred spiral galaxies (class SB). A few disk galaxies contain relatively little gas and dust; these are called lenticular galaxies (class S0). Irregular galaxies (class I) are generally shapeless and tend to be rich in gas and dust.

Answer to Question 2

False

[elizabeth18]

Wow, this really help

[coreycathey]

Excellent