What is the reason that stars move off of the main sequence and on to the red giant branch? a. The star no longer has sufficient hydrogen in the core to fuse helium; thus the core begins to contract and heats its immediate surroundings. b. Over time, the star's gravity is able to collect so much mass as it gobbles up its surrounding planets that the star expands to its new giant state. c. Over time, helium becomes hot enough to begin fusing, and as a result, the increased radiative pressure from these reactions pushes outwards against gravity, expanding the star. d. Over time, the star loses so much mass due to fusion that the gravity is no longer able to hold it in its previous compact form. As a result, the star is able to grow and expand. e. The star no longer has sufficient hydrogen in the core to fuse helium; thus the core expands outwards to consume more available hydrogen and the star grows in the process.
What is the reason that stars move off of the main sequence and on to the red giant branch?
| a. |
The star no longer has sufficient hydrogen in the core to fuse helium; thus the core begins to contract and heats its immediate surroundings. |
|
| b. |
Over time, the star's gravity is able to collect so much mass as it gobbles up its surrounding planets that the star expands to its new giant state. |
|
| c. |
Over time, helium becomes hot enough to begin fusing, and as a result, the increased radiative pressure from these reactions pushes outwards against gravity, expanding the star. |
|
| d. |
Over time, the star loses so much mass due to fusion that the gravity is no longer able to hold it in its previous compact form. As a result, the star is able to grow and expand. |
|
| e. |
The star no longer has sufficient hydrogen in the core to fuse helium; thus the core expands outwards to consume more available hydrogen and the star grows in the process. |
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