Re: The Universe In Action


This does have that "Wow!" factor when seen in time-lapse. I mean, I knew things moved, and have noticed changes in a few things over the decades that I've been looking up, but when you see the time-lapse... "Wow!".

I couldn't find any old images of the Horsehead Nebula (say, ca. late 1960s-early 1970s) to show a comparison to modern images of it, but personally, I think that nebula's right side has moved far enough away from the horse's "neck" that now it looks more like it should be called the "Sasquatch" Nebula than a horsehead!

"Keep looking up!"

-----Original Message-----
From: Roy Diffrient <mail@...>
To: BBAA Groups Io <>
Sent: Tue, Jun 29, 2021 10:36 pm
Subject: [BackBayAstro] The Universe In Action

Think the universe is moving so slow and distances so vast that no change is visible?  A look at the time lapse images here could change your mind.  Surprising motion of stars and DSO’s shown by Tom Polakis.  This from the Amastro list.

One of my fav’s is the difficult reflection nebula Gyulbudaghian’s Nebula – This image series really explains a lot about the visibility of this object over the last 25 years or so.  



“Something I've spent too much time doing is creating time-lapse sequences using images taken many decades apart.  In this case, here's the motion of HD 134439 and HD 134440 over the course of 34 years.  The 1954 image is from the first Palomar Sky Survey, while the image from 1987 is a UK Schmidt image. The pair of stars moved by more than 2 arcminutes between the two frames.

In case there's interest, here's my gallery of deep-sky object animations.


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