The terms ‘Event Horizon’, ‘Singularity’, ‘String Theory’ and ‘Standard Model’ are sometimes seen in the news in the context of
[UPSC Civil Services Exam – 2017 Prelims]
(a) Observation and understanding of the Universe
(b) Study of the solar and the lunar eclipses
(c) Placing satellites in the orbit of the Earth
(d) Origin and evolution of living organisms on the Earth
All of these concepts are related to the observation and comprehension of the universe: the standard model of particle physics mathematically defines electromagnetism, the strong and weak nuclear forces, and the Higgs mechanism; string theory is used to understand quantum phenomena within the context of quantum physics; the structure of a black hole includes a singularity concealed by an event horizon, and objects within the event horizon are trapped forever because the escape velocity exceeds the speed of light.
Therefore, option (a) is the correct answer.