Question

which characteristic is shared by both dark matter and baryonic matter? (1 point)
o they both interact with each other.
o they both have gravity.
o they both have been directly observed by scientists.
o they both are capable of absorbing light

Explanation:

• Option 1: Dark matter and baryonic matter don't necessarily interact with each other in the same way; dark matter's interaction is limited.
• Option 2: Both dark matter and baryonic matter exert gravitational force. Baryonic matter (like stars, planets) has gravity, and dark matter's gravitational influence is observed in galaxy rotation curves, etc.
• Option 3: Dark matter has not been directly observed; its existence is inferred from gravitational effects. Baryonic matter can be directly observed.
• Option 4: Dark matter does not absorb light (it's "dark"), while some baryonic matter can, but not all, and this is not a shared characteristic.

Answer:

B. They both have gravity.