Astrobiology, Space Weather/Planetary Defense, Planetary Science/Exploration.
Any 3 Applications (Some are in the same category of use as described above).
Astrobiology is not in technical use, exobiology which is the study of life beyond earth's atmosphere, as on other planets
Space weather is any phenomena related to the radiation and particles emitted by the Sun, especially in the vicinity of the Earth that may have an effect on the Earth or human activity in space.
Planetary Defense compromises the methods by which near-Earth object on a potential collision course with Earth could be diverted away, preventing destructive impact catastrophes.
Planetary science is the branch of astronomy that deals with the planets of the solar system.
Planetary exploration is the process of collecting/discovering the information about the planetary system and to analyze its physical and chemical and environmental characteristics.