1. What is the Event Horizon of Cygnus X-1? a. 21 m b. 21 km c. 21 AU d. 21 ligh
ID: 1781526 • Letter: 1
Question
1. What is the Event Horizon of Cygnus X-1?
a. 21 m
b. 21 km
c. 21 AU
d. 21 light years
2. The Milky Way appears as an irregular band of diffuse light that arches across the night sky. Why is this so?
a. The stars of the galaxy are low mass stars, so they are intrinsically very faint.
b. Most of the stars of the galaxy are so distant that their total light is blended together into a faint band.
c. The band of the Milky Way is comprised of dimly glowing interstellar gas clouds.
d. The band of the Milky Way is external to the galaxy.
3. What features of spiral galaxies are evident in this view of the Milky Way?
a. A central super massive black hole.
b. Glowing supernpve remnants.
c. A central bulge and dust lane.
d. Active star formation regions in the spiral arms.
4. How does this elliptical galaxy differ in appearance from a spiral galaxy?
a. It has a bright central core.
b. It has an indistinct outer boundary.
c. It has a central bulge and dust lanes.
d. There are no visible spiral arms.
Explanation / Answer
1)Event Horizon of Cygnus X-1?
21KM
2)The Milky Way appears as an irregular band of diffuse light that arches across the night sky. Why is this so?
The band of the Milky Way is comprised of dimly glowing interstellar gas clouds.
3)What features of spiral galaxies are evident in this view of the Milky Way?
Active star formation regions in the spiral arms.
4)How does this elliptical galaxy differ in appearance from a spiral galaxy?
Spiral galaxies have arms spiraling out from the central bulge of the galaxy and contain newer stars and has more gasses to form new stars.
Elliptical galaxies are normally formed after spiral galaxies merge. The formation is an elliptical mass of stars without any arms. When galaxies merge, the process destroys gasses needed to form new stars. So in an elliptical galaxy we would notice more older stars and less stars in the process of forming.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.