When we look at our galaxy, we find it has more mass than the matter we see. Much more. This is the first clue that there must be dark matter in the Universe.
Mapping the Galaxy
Radio signals from pulsars are delayed slightly by the ionized plasma in our galaxy. This allows us to measure the amount of plasma in our galaxy by observing the pulses of more than 2000 pulsars in our galaxy.
- Page 2 of 2
- 1
- 2