Strange Balls found on Queensland beaches could be toxic 'space debris': experts

Most likely Hydrazine propellant tanks:

Even if they aren’t, it’s best to assume they are and stay the fuck away. Hydrazine is nasty

Non-paywall link at a more legit news source

It’s propellant tanks, saved you a click.

"Expert" is a term used when no convincing evidence of expertise can be provided

>Space Balls

Not like, guerilla marketing for the new movie?

May the Schwartz be with you.