Question

1. what three stages will our sun undergo after the main - sequence phase?
2. what does a massive star become after its main - sequence phase?
3. what two types of energy do supernova release?
4. what two objects can be created after the supernova of a high mass star?

task 7: types of stars article
use any method to read the stars article on the sea sky websites. answer the questions below as you read.
full url: http://www.seasky.org/celestial - objects/stars.html
types of stars

1. what does a main - sequence star maintain during this stage?
2. what do very massive stars become during the main - sequence phase?
3. what happens to the outer surface of a star during the red giant phase?
4. why does a white dwarf glow?
5. why can a brown dwarf be considered a \failed star\?
6. what is a variable star?
7. what force causes binary star systems to stay together?

task 8: star size comparison
use any method to watch the star size comparison 2 video by morn1415. as you watch, answer the questions below.
turn on closed captioning to answer questions!
full url: https://www.youtube.com/watch?v=gow8tf7htga

1. what type of star is sirius a?
2. when will rigel turn into a red supergiant?
3. what is the biggest known star in the milky way galaxy?
4. true or false: there are many hundred stars in our galaxy and nearly all of them are circled by at least one planet.
5. what galaxy will collide with our milky way galaxy in a few billion years?
6. what is the laniakea?

Explanation:

These questions are about stars, their life cycles, and related astronomical phenomena. The subfield of Natural Science that best applies is Physics (specifically Astrophysics), as it deals with the study of celestial objects like stars, their properties, and evolution. To answer these, one would refer to astronomical concepts:

• Q39: After main - sequence, the Sun will become a red giant, then a planetary nebula, and finally a white dwarf.
• Q40: A massive star becomes a red supergiant after main - sequence.
• Q41: Supernovas release electromagnetic energy (like light, X - rays) and kinetic energy (from the explosion).
• Q42: After a high - mass star supernova, a neutron star or a black hole can be created.
• Q43: A main - sequence star maintains hydrostatic equilibrium (gravity balanced by thermal pressure from nuclear fusion).
• Q44: Very massive stars become O - type or B - type main - sequence stars (hot, luminous).
• Q45: During the red giant phase, the outer surface expands and cools.
• Q46: A white dwarf glows because it is hot (from residual heat, as it has no nuclear fusion, just radiating stored thermal energy).
• Q47: A brown dwarf is a “failed star” because it doesn't have enough mass to start hydrogen fusion in its core (mass less than about 0.08 solar masses).
• Q48: A variable star is a star whose brightness (magnitude) changes over time, due to internal (e.g., pulsations) or external (e.g., eclipsing binary) factors.
• Q49: Gravitational force causes binary star systems to stay together (mutual gravitational attraction).
• Q50: Sirius A is a main - sequence star of spectral type A (a blue - white main - sequence star, or more precisely, a main - sequence star in the A spectral class, also considered a type of main - sequence star, often called a “main - sequence star” or a “white main - sequence star”, specifically a type A main - sequence star, sometimes called a “dwarf star” in the main - sequence context, but more accurately, a main - sequence star of spectral type A).
• Q51: Rigel will turn into a red supergiant when it exhausts the hydrogen in its core (in a few million years, as it is a massive star with a short main - sequence lifetime).
• Q52: The biggest known star in the Milky Way Galaxy is currently considered to be Stephenson 2 - 18 (or UY Scuti was previously thought, but recent measurements favor Stephenson 2 - 18).
• Q53: False. Our galaxy has billions of stars, and many (but not nearly all) are thought to have planets.
• Q54: The Andromeda Galaxy (M31) will collide with the Milky Way in a few billion years (about 4 - 5 billion years).
• Q55: Laniakea is the supercluster of galaxies that contains the Milky Way; it's a large - scale structure of the universe, a galactic supercluster that our galaxy is a part of.

Answer:

1. Red giant, planetary nebula, white dwarf
2. Red supergiant
3. Electromagnetic energy, kinetic energy
4. Neutron star, black hole
5. Hydrostatic equilibrium (gravity - thermal pressure balance)
6. O - type or B - type main - sequence star (or hot, massive main - sequence star)
7. Expands and cools
8. It is hot (radiating residual thermal energy)
9. Insufficient mass for hydrogen fusion in core
10. A star with changing brightness over time
11. Gravitational force
12. Main - sequence star (spectral type A, or type A main - sequence star)
13. When it exhausts core hydrogen (in a few million years)
14. Stephenson 2 - 18 (or UY Scuti, depending on recent research)
15. False
16. Andromeda Galaxy (M31)
17. The supercluster of galaxies containing the Milky Way