Question

Why does the sky begin to glow at night?

Answer 1

Answer:

When a meteoroid enters the Earth's atmosphere at a speed higher than 20 km/s (72,000 km/h; 45,000 mph) aerodynamic heating of that object produces a streak of light, from the glowing object as well as the trail of glowing particles that it leaves in its wake

Answer 2

Answer:

because at night the sky will take heat from water