atom
Velocity and volume are science words.
Some words related to space science that start with A:Apollo Missionsastronautsastronomyasteroidsatmosphereadventureamazing photosArmstrong, Neil
Science Solar System Sun
A science letter that starts with A is ASTRONOMY!!
Igneous!
Uranium and ultraviolet rays are science words. They begin with the letter u.
Quartz
Ferrous.
x-ray
Jupiter
Zinc.
The universe!