1. Astronomy: The subastral layer of the atmosphere is the layer closest to the surface of the Earth, extending up to about 10 km above the surface, where the air pressure and temperature conditions are suitable for airplane flight.
2. Literature: The city's skyscrapers pierced the subastral ceiling, their tops disappearing into the clouds on a day that was neither rainy nor sunny.
3. Meditation: She decided to sit outside under the stars to meditate, focusing her thoughts on the vast expanse of the subastral universe.
4. Environmental Science: The harmful environmental impacts of pollution can be seen in the subastral habitat of many creatures, where plastics and toxic chemicals have lethal effects.
5. Philosophy: The subastral implications of the newly discovered cosmic horizon sent shockwaves through the scientific and philosophical communities.