Workshop

Well, it's an alpha version. Jupiter will definitely have plenty of time to wreak havoc, considering it can only collapse on its own accord. Plus, its mass is increasing, and it can quickly overwhelm a city. So, yes, we still need to think about the abilities. But I'd rather add ND to the city, as they have fewer.

Is it a gravitational maneuver?

Yes.

Like satellites.

It's larger than Mercury, but yes.

I suggest increasing it from a quarter to a third. Is an additional target selected?

It is. We can also add an ultimate ability if it's too weak.

How many times can it be used?

Until you conquer everything and win.

I forgot to add that gravitational lensing isn't used to measure mass. :)
I've corrected the rest.