Week 7, clip 9

Timepoint:  16:02.1

1) Why were MaCHOs discarded as a possible explanation for Dark Matter?  Please select the most reasonable choice from the options presented below.

- Scientists are nerds and want a theory about WIMPS to succeed over MaCHOs.
- Measurements of microlensing events suggest there are not enough MaCHOs to explain dark matter.
- If dark matter were explained by MaCHOs, the solar system would be filled with neutron stars and brown dwarfs.
- It was discovered that MaCHOs cannot physically exist due to the lack of interactions with the Higgs field.

Answers:
1) Measurements of microlensing events suggest there are not enough MaCHOs to explain dark matter.