Moss in a Petri dish, OR supernova?

[Ray McCarthy]

Supernova bubble clocked at 19,000,000 km/h

Astronomers have produced a fetching animation of the inexorable outwards expansion of the remains of the Tycho Type Ia supernova - a white dwarf in a binary star system which went bang in spectacular fashion back in 1572.
...
NASA notes that the maximum speed of the blast wave is around 19,000,000 km/h (roughly 12,000,000 mph).

One weird animation.

Commetard observes

A long time ago and far, far away...
The phrases "went bang in spectacular fashion back in 1572." and "at a distance of some 10,000 light years" should not be used together. Not for a long while anyway.

I presume the first arrival of the event 10,448 years ago approximately was visible here in 1572.

 

[Ursa major]

The phrase

When the star that created this supernova remnant exploded in 1572

raised an eyebrow at Chez Ursa.

 

[J Riff]

12 million MPH, approx. Hauling asteroid.

 

[BAYLOR]

Still waiting for red giant Betelgeuse to go nova .

 

[Ray McCarthy]

But does anyone else think the animated simulation looks like moss growing?

 

[Vertigo]

yes or I could come up with far more unsavoury similes.