What happens if all 9 planets come in a straight line?

First of all, there are only 8 planets. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Now to answer your question, the chances of the 8 planets and Pluto coming together in a exact straight line will never happen. read more

First of all, there are only 8 planets. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Now to answer your question, the chances of the 8 planets and Pluto coming together in a exact straight line will never happen. This is because their orbits are tilted at different angles and are not perfectly aligned with the sun’s position. read more

When astrologers speak of the planets being aligned (something which doesn't really concern astronomers) they don't mean that the planets will actually all lie on a straight line at some instant of time. read more

In an alignment, NASA writes, the planets may line up with the sun or they may only appear in a line with the earth at an angle from the sun. Syzygy: Group of Three When at least three bodies are aligned in the same gravitational system the group is known as a syzygy. read more