Some Potential MACHOs (Massive Compact Halo Objects) Emit Radiation

question 87

Multiple Choice

Some potential MACHOs (massive compact halo objects) emit radiation. Why are they nevertheless considered dark matter?

• A) They are not as bright as a normal star and hence are not visible across great distances of space.
• B) They do not emit light in the visible wavelength range.
• C) They emit radiation only in the form of particles of dark matter.
• D) They are made of particles of dark matter that release some radiation.

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