Stars, Galaxy and Milky way

21. What is the name of the brightest star in the night sky?
a) Sirius
b) Betelgeuse
c) Polaris
d) Vega

22. What is the name of the galaxy that is thought to be the largest in the observable universe?
a) Andromeda Galaxy
b) Milky Way Galaxy
c) IC 1101
d) Centaurus A

23. What is the name of the process by which a star explodes in a brilliant display of light and energy?
a) Supernova
b) Hypernova
c) Nova
d) Meganova

24. Which of the following is not a component of the Milky Way Galaxy?
a) Bulge
b) Halo
c) Disk
d) Nebula

25. What is the name of the galaxy that is thought to be the oldest in the observable universe?
a) Milky Way Galaxy
b) Andromeda Galaxy
c) UDFj-39546284
d) Ursa Major II