Never.
I read a book and it says they never aligned about 4.6 billions of years.
May 05 2000 was the last planetry alignment
They never did. In all the solar systems history, all 8 planets never alighned in a straight line
Yes.
We believe that all of the planets formed at about the same time from the planetary nebula.
Technically it CAN'T be aligned with the planets, because the planets' positions change all the time.
It has never happened, and never will. The center of the galaxy does not lie in the plane of the ecliptic, so all the planets can never line up pointing that way.
"One calculation of alignments within around thirty degrees (about as close as they can get) shows that the last such alignment was in 561 BC, and the next will be in 2854. All nine planets are somewhat aligned every 500 years, and are grouped within 30 degrees every 1 to 3 alignments."http://curious.astro.cornell.edu/question.php?number=203
There is always a problem with using the term Planetary alignment. How close do you want the planets to be in alignment. Do you include the ecliptic? If you want all the planets to be aligned in a straight line with only a 1 mile difference, then you'll have a wait a long long while - probably infinity. Even then, you have to take into account the ecliptic as space is 3 dimensional, so the planets will never align in a perfect straight line as seen from Earth. The last "close" alignment was in May 2000 and nothing happened then.
Never.
I read a book and it says they never aligned about 4.6 billions of years.
May 05 2000 was the last planetry alignment
They have in common is that they are the last planets in the solar system
not really but my teacher told us a story why she was named venus it all started here "the 9 planets aligned on march 10 1982 dat was the day she was born the planets aligned very quik she said. but i dont really know about it much sooo.....
They never did. In all the solar systems history, all 8 planets never alighned in a straight line
No. Almost never happens. Depends on how well aligned you mean, occasionally all the planets will be within 45° (as seen from the Sun) or within a cone that has the vertex at the Sun and has an opening of 30°, this happens every decade or so. All the planets can never align less than 2° because the deviation from the ecliptic for some of the planets is greater than this.
Neptune would finish last, because it has the longest orbit and the slowest velocity.