Front

What is a dark halo in the context of galaxies?

Back

A dark halo, or dark matter, is a shroud of matter surrounding every galaxy that does not emit light and is detectable through its gravitational effects.

Front

In which arm of the Milky Way does our Sun reside?

Back

Our Sun lies in the Orion arm of the Milky Way.

Front

How do the majority of stars orbit in the Milky Way?

Back

The vast majority of stars orbit in mostly one direction around the central bulge of the Milky Way.

Front

What significant discovery did astronomers make about the structure of the Milky Way using radio studies?

Back

Astronomers discovered that the Milky Way has at least 5 major spiral arms.

Front

What evidence supports the idea that the Milky Way formed from collisions of smaller galaxies?

Back

Evidence includes the chaotic orbits of halo stars.

Front

What is the significance of dark matter in the formation of galaxies?

Back

Dark matter plays a crucial role in the formation and structure of galaxies by providing the necessary gravitational pull to hold galaxies together.

Front

What are the main components of the Milky Way galaxy?

Back

The main components of the Milky Way galaxy include the central bulge, spiral arms, halo, and dark matter.

Front

What role do spiral arms play in the Milky Way?

Back

Spiral arms are regions of higher density where stars, gas, and dust are concentrated, and they are sites of active star formation.

Front

How does the Milky Way's rotation curve provide evidence for dark matter?

Back

The rotation curve of the Milky Way shows that stars in the outer regions orbit at higher speeds than expected, indicating the presence of unseen mass, or dark matter.

Front

What is the central bulge of the Milky Way?

Back

The central bulge is a dense region at the center of the Milky Way, containing a high concentration of stars and possibly a supermassive black hole.