Science

[Dead Duck]

There are cheaper alternatives.

 

[DoggyDaddy]

There are cheaper alternatives.

[video=youtube;phXTSjRwdJY]https://www.youtube.com/watch?v=phXTSjRwdJY[/video]

 

[T.Lex]

HALO may be real.

https://www.livescience.com/circular-radio-objects-space.html

Astronomers have discovered four faint objects that at radio wavelengths are highly circular and brighter along their edges. And they're unlike any class of astronomical object ever seen before. The objects, which look like distant ring-shaped islands, have been dubbed odd radio circles, or ORCs, for their shape and overall peculiarity.

But wait, they're also cloaked:

All four ORCs are bright at radio wavelengths but invisible in visible, infrared and X-ray light.

Waiting for the Pillar of Autumn to be started....