Before Present (BP) years is a time scale used mainly in geology and other scientific disciplines to specify when events in the past occurred.his usage differs with the recommendation by van der Plicht & Hogg, followed by the Quaternary Science Reviews, both of which requested that publications should use the unit  a  [for year] and reserve the term BP for radiocarbon estimations.
The standard model of cosmology indicates that the total massâenergy of the universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy. Thus, dark matter constitutes 84.5% of total mass, while dark energy plus dark matter constitute 95.1% of total massâenergy content.
Best Answer: Many microwave telescopes are used to study dark energy/matter. You cannot see dark matter and that is what makes it interesting. Microwave telescopes survey thousands of clusters of galaxies to find this dark matter. Recent observations show that the universe is made up of 74% dark energy, 22% dark matter, and 4% ordinary matter.