Answer:
What is quantum physics? Put simply, it's the physics that explains how everything works: the best description we have of the nature of the particles that make up matter and the forces with which they interact. Quantum physics underlies how atoms work, and so why chemistry and biology work as they do.
Answer:
Jupiter and Saturn will come within 0.1 degrees of each other, forming the first visible "double planet" in 800 years.
Explanation:
The 2020 great conjunction is especially rare, the planets haven't been this close together in nearly 400 years, and haven't been observable this close together at night since medieval times, in 1226.
The second one, air is a poor conductor. If it weren't it wouldn't be used as such in construction. It's not the best insulator, but is quite efficient, and much cheaper to include a layer of air inside a wall than to add additional layers of asbestos :)
They depend on both MASS and DISTANCE