you mean spiritual "ascension" to the 5th dimention ? in Japanese it means 「上昇(じょうしょう)」, but we use Katakana 「アセンション」in this case　→　http://www.jp-spiritual.com/2012event1.htm *"I would like to ascend with the planet"=私は宇宙と共にアセンションしたいです。 Let's ascend together! 一緒にアセンションしましょう！＾＾/

上昇 （じょうしょう） perhaps ? And as Eliot said, the sentence itself can't be properly translated without a context...

First of all, what do you mean? I'd like to ascend with the planets. That is a New Age phrase and is made by joining a bunch of words together to make an impression on average people. It means nothing to those without a background in the topic. So, do tell what you mean by "ascension". Ascension (to Heaven) = 昇天 【しょうてん】 A more general word for ascend is: 上がる[あがる]