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| Possibilities |
Pros  and Cons  |
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MACHOs (Massive Compact Halo Objects)
- Neutron Stars & Black Holes
- White Dwarfs
- Brown Dwarfs
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WIMPs (Weakly Interacting Massive Particles)
- Exotic subatomic particles, such as axions, massive neutrinos, photinos
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Hydrogen Gas
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Assessment: Could Einstein’s Theory of Gravity, which has proved to be correct in all cases so far, be somehow wrong? Justify your answer.
Einstein’s Theory in a Nutshell: Space-time tells matter how to move. Matter tells space-time how to bend.
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