Another name for a clear night sky is a cloudless sky or starry night.
Meteors hit the Earth's atmosphere and burn up in a second or two. They streak across the night sky and are gone. Comets are farther away, and move only slowly, night by night, across the sky.
The word that is used for a group of stars in the night sky is a star cluster.
Yes, Jupiter is currently the brightest thing in the night sky, not counting the moon.
Over the long run, the Moon doesn't interfere with observations of distant stars and galaxies. On any particular night, there will be an area of the sky in which the bright moonlight (especially when full or near-full) will wash out the background stars. This is because Earth's atmosphere scatters light and diffuses the glow across the sky somewhat. But last night, or tomorrow night, the Moon was/will be in a different area of the sky and our observations won't be affected. For a professional astronomer who is planning an observation of a distant object, it's important to schedule the observation for a time when the Moon isn't in that area of the sky. Fortunately, the apparent motions of the Moon are precisely predictable.
Entirely predictable. It's so predictable that we can measure the position of the Sun in the sky to determine our position, a method we call "celestial navigation".
Lightening.
It is impossible to say. A meteor is visible in the sky somewhere on Earth every few seconds.
We Are Night Sky was created in 2005.
The Night Sky was created in 2006.
The duration of The Sky at Night is 1800.0 seconds.
Night Sky Replies was created in 1994.
The Sky at Night ended on 1957-04-24.
The Sky at Night was created on 1957-04-24.
Night Sky Mine was created in 1997.
Charms of the Night Sky was created in 1998.
Auroras appears in the night sky by atoms and molecules. Auroras is lights in the sky.