Question

galaxy shapes worksheet
name: marissa h period: 6 date: 111
vocabulary

1. galaxy: a massive, gravitationally bound system consisting of stars. an interstellar medium of gas & dust and dark matter
2. spiral galaxy: a type of galaxy characterized by spiral arms extending from a central bulge
3. elliptical galaxy: a type of galaxy characterized with an approximate ellipsoidal shape and a smooth, nearly featureless brightness profile.
4. irregular galaxy: a galaxy that does not have a distinct regular shape unlike a spiral or an elliptical galaxy.
5. lenticular galaxy: a type of galaxy intermediate between an elliptail and a spiral galaxy. it is a disk galaxy that has used up or lost most of its interstellar matter and therefore has little or no star formation

comprehension questions

1. two differences between spiral and elliptical galaxies: spiral galaxies have spiral arms and contain gas and dust, while elliptical galaxies are smooth and lack these
2. why irregular galaxies form many stars:
3. how lenticulars are similar to spirals:
4. why barred spirals have bars:

galaxy classification
a. spiral b. barred spiral c. elliptical d. irregular e. lenticular

1. ____ bar - shaped center
2. ____ no arms, little star formation
3. ____ chaotic, lots of gas
4. ____ disk with spiral arms
5. ____ oval shape, older stars

drawing section
draw and label one galaxy type below.
constructed response

Explanation:

For comprehension questions: 2. Irregular galaxies have abundant gas/dust fueling star formation. 3. Lenticular galaxies share a disk structure with spirals. 4. Bars form from gravitational instabilities channeling material to the center. For classification: 1. Barred spirals have bar-shaped centers. 2. Lenticular galaxies lack arms and have little star formation. 3. Irregular galaxies are chaotic with much gas. 4. Spiral galaxies have disks with arms. 5. Elliptical galaxies are oval with older stars. The drawing section requires illustrating a labeled galaxy type (e.g., spiral with arms and bulge).

Answer:

Comprehension Questions:

1. They contain large amounts of gas and dust, which are needed for star formation.
2. They have a disk structure like spiral galaxies.
3. Gravitational instabilities in the galaxy's center create a bar that channels gas and stars.

Galaxy Classification:

1. B. Barred Spiral
2. E. Lenticular
3. D. Irregular
4. A. Spiral
5. C. Elliptical

Drawing Section: (Example) Draw a spiral galaxy with labeled spiral arms, central bulge, and disk.