Question

drag the tiles to the correct boxes to complete the pairs.
match the following phases of stellar evolution to its characteristic.
black hole red giant black dwarf brown dwarf white dwarf
does not undergo hydrogen fusion
has an outer shell of burning hydrogen
and a core of helium
a white dwarf that has lost all its energy
has a core of carbon that is not massive
enough to fuse
formed from the collapse of a white dwarf beyond 1.5 solar masses

Explanation:

• Brown dwarf: It does not have enough mass to start hydrogen fusion.
• Red giant: After the main - sequence phase, a star expands. It has an outer shell of burning hydrogen and a core of helium.
• Black dwarf: A white dwarf cools down over time. When it has lost all its energy, it is called a black dwarf.
• White dwarf: It is the remnant of a low - to medium - mass star. It has a core of carbon (in many cases) that is not massive enough to fuse further (under normal circumstances for a single white dwarf).
• Black hole: If a white dwarf (in a binary system, for example) accretes enough mass (beyond the Chandrasekhar limit of about 1.4 - 1.5 solar masses), it can collapse to form a black hole.

Answer:

• “does not undergo hydrogen fusion” → brown dwarf
• “has an outer shell of burning hydrogen and a core of helium” → red giant
• “a white dwarf that has lost all its energy” → black dwarf
• “has a core of carbon that is not massive enough to fuse” → white dwarf
• “formed from the collapse of a white dwarf beyond 1.5 solar masses” → black hole