My name isXXXXX have helped a myriad of customers on JustAnswer with their camera opinion and use questions.
Out of the 2 cameras you have selected, the Panasonic Lumix FZ-150 I think should be your choice. The photos I have seen from this camera is fantastic, very sharp, so sharp in fact they beat out some lower level DSLR cameras, and rival some of the mid range DSLR - and that says ALOT.
You need to keep in mind that no matter what, the quality of the lens is really what determines the quality of the photo with today's cameras. With this, if you are considering making a big hobby of shooting the skyscapes, a DSLR may be a consideration if you have the budget for a DSLR body and then a quality lens(which can cost as much as the body), but the Panasonic Lumix FZ-150 is a GREAT
camera that makes for VERY VERY sharp images.
Not to throw yet another wrench in the gears, but something like a Sony NEX5 also makes for awesome images and comes with a 18-55 type lens that you would find on a DSLR BUT has functionality like point&shoot/SLR hybrid. The NEX5 also produces great images.
Let me know if you need more information but the Panasonic Lumix FZ-150 has my vote, in fact, if I wasn't shooting DSLR myself for everything including work and play, I would probably get the panasonic myself. It all comes down to lens quality at this point in the technology stage.
The only thing you need to be able to do is drag the shutter on the cameras, so you aren't forced into High ISO situations(think of this as sensitivity to light of the sensor) and thus potentially grainy pictures, so just do the looking around of night images and high ISO reviews
. Otherwise if you can control the shutter and keep the ISO low, youre going to have some gorgeous images.
Just make sure you tweak your settings for file size, image "fine"ness, and maybe look into some basic editing software like Adobe Lightroom, you will make some GORGEOUS images.