Question

star type\ttemperature (c)\tbrightness (compared to sun)
dwarf (black)\t2,500\t0.0001 x
dwarf (white)\t8,000 - 15,000\t0.01 - 0.5 x
giant (red)\t3,000 - 6,000\t100 - 4,000 x
main sequence\t5,000 - 15,000\t1 - 1,000 x
supergiant (red)\t4,000\t100,000 - 1,000,000 x

questions
use the information in this lab to answer the questions below.

1. do all protostars become stars? why or why not?
2. which type of star is the brightest?
3. how is a massive stars stage 4 different than an average stars stage 4?
4. why do some massive stars become neutron stars and others black holes?

Explanation:

1. Not all protostars become stars. A protostar needs to reach a high - enough core temperature and pressure to start nuclear fusion. If it doesn't reach these conditions, it won't become a star.
2. Supergiant (red) stars are the brightest as they have the highest range of brightness values (100,000 - 1,000,000 x compared to the Sun).
3. A massive star's stage 4 is different from an average star's stage 4 in that massive stars have more mass, which leads to higher core temperatures and pressures. This causes them to burn through their fuel faster and end their lives in more dramatic ways, like supernovae.
4. Some massive stars become neutron stars or black holes because when they run out of fuel, the core collapses under its own gravitational force. If the core mass is between about 1.4 and 3 solar masses, it can form a neutron star. If it's more than about 3 solar masses, it can form a black hole.

Answer:

1. No, not all protostars become stars because they may not reach the necessary core temperature and pressure for nuclear fusion.
2. Supergiant (red) stars are the brightest.
3. Massive stars in stage 4 have more mass, higher core temperatures and pressures, and burn through fuel faster, ending in supernovae.
4. Some massive stars become neutron stars or black holes due to core collapse under gravitational force depending on core mass.