Dark matter

Question

absorb light,
emit radiation, and
been observed directly.

Answer 1

It seems you're mentioning characteristics related to dark matter. However, it's important to clarify some points about dark matter:

1. Absorption of Light: Dark matter does not absorb light. In fact, one of the defining characteristics of dark matter is that it does not interact with electromagnetic radiation (light) in any significant way, which is why it is termed "dark."

2. Emission of Radiation: Dark matter is not known to emit radiation like ordinary matter does. Since it does not interact with light, it does not emit or reflect light, making it essentially invisible.

3. Direct Observation: Dark matter has not been directly observed. Instead, its existence is inferred from gravitational effects on visible matter, such as the rotation curves of galaxies, gravitational lensing, and the cosmic microwave background radiation.

In summary, dark matter does not absorb light, emit radiation, or get observed directly; rather, it is detected through its gravitational influence on the universe. Its exact nature remains one of the key questions in astrophysics and cosmology.