What is it called when all the planets are aligned?

Answer 1

It isn't called anything because it can never occur. It never has occurred in the past, and never will occur in the future. Even if all the planets were at the same heliocentric longitude relative to the Sun, the tilts of their orbits vary enough from the plane of the ecliptic that they still wouldn't be in line.

Another, more accurate, answer

Think of a very simple alignment of two planets, Earth and Venus. This only occurs a little more than once a century. To add a third planet to this alignment would take many millennia. To have all eight planets aligned would require an infinite amount of time.

Even so, the word for it is syzygy.

Answer 2

Syzygy is a word used to describe three bodies in alignment. - this could be the sun, earth, moon or another planet. If its specifically for planets, the word conjunction is used as when viewed from the earth.

Answer 3

Syzygy , when three or more planets are in alignment .
because its nice to make more room.

Answer 4

Planetary alignment, but this never has and never will happen. There is also another name for it I can't remember it, but it starts with an a and has three Y's in it.

Answer 5

A planetary alignment.

Conjunction is the term when they just appear to be aligned from an observer's point of view.

Answer 6

The 8 planets never have and never will all line up. But when two planets are aligned it is called a syzygy

Answer 7

No. It is when the moon is covered completely by earth's shadow.

Answer 8

There is no name for this because it's so statistically improbable that it'll likely never happen.

Answer 9

It is called planetery alignment.