Immense Heaven

The astronomy picture of the day is Laniakea, the newly discovered/defined super-structure that includes our Milky Way Galaxy. There’s already a Wikipedia entry. The massive Virgo Supercluster is now just an “appendage” in the bigger scheme of things.

It’s hard to discern shape when you’re sitting within. The thing I’ve never heard referenced is how astronomers map structure taking into account the tens and hundreds of millions of years between one end and another. Not just big space, but long stretches of time.

We’re on one side of Laniakea, but we view the other side not as it is today, but as it was almost five hundred million years ago. All galaxies are in movement relative to each other. Most are flying apart. Only close associations share a gravitational attraction. Astronomers admit the boundaries of superclusters are vague. We know, for example, the Triangulum Galaxy, imaged here by Alexander Meleg …

Triangulum_Galaxy

… is gravitationally bound to our Local Group. It’s a probable satellite of the Andromeda Galaxy. We might be colliding with that whole array in a few billion years. But will our star stuff be mixing it up with aliens on the other side of Laniakea in the endless eons to come? Who can be sure?

About catholicsensibility

Todd lives in Minnesota, serving a Catholic parish as a lay minister.
This entry was posted in Astronomy. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s