The UniverseAnswer
How do we know dark matter exists if we cannot see it?
We can’t see dark matter, but we can measure its pull in five different ways, so here is the evidence, the case for changing gravity instead, and what is still unknown.
TOPIC
Dark matter.
Stories and answers about #Dark matter
FROM THE QUESTION LIBRARY
Short answers, with sources.
The UniverseAnswer
Is antimatter real, or just science fiction?
Antimatter is measured in nature and laboratories, while its cosmic imbalance remains unexplained.
Life in the UniverseEssay · personal view
The Questions I Would Ask an Alien
If I ever met a visitor from another world, I would skip the small talk. I would ask what its civilization knows about beginnings—and how it knows.