Observing Twilight on Mars
The science team from NASA occasionally captures stunning images of twilight and sunset on Mars. By taking these photos they can better determine how high the Martian dust extends into our atmosphere. Some pictures show that the twilight glow is always visible but gets increasingly fainter a few hours before sunrise and after sunset. The Martian twilight is caused by high altitude dust and sunlight being scattered around the night side of the planet.
Exploration #2 Sunrise on Mars
A nebula is a diffuse mass of interstellar dust or gas or both, visible as luminous patches or areas of darkness depending on the way the mass absorbs or reflects incident radiation. The gravitational forces between particles is directly proportional to their masses, meaning that the more massive the nebula, the greater their gravitational attraction will be on other bodies and particles near by. As the masses grow further together they attract more dust and gas. Some of the more popular nebula's are the Crab, Eagle, Orion, Pelican, Ring, and Rosette Nebula.
After Effects: Realistic Space Nebulas Test 1