Craft was small as a star, it was a dot that flashed, then it kept getting bigger, rectangular & looked like thrusters slowing it down

Watching for the Blue Moon on 08/29/23. Clear sky so I was star watching. I saw what I think was a satellite going South to North.
It was in location of Big Dipper.
Watching some dim Stars above the Big Dipper I noticed a Star flash.
I watched this dot size object flash pure White.
This object kept getting bigger.
It looked like it was coming in from outer space. It did not come from N, S, E, or West.
It came straight down from the Sky!
It kept getting closer towards earth and it would Flash pure white.
It would Flash about every 10-20 seconds as it got closer.
It started looking rectangular & the Flash reminds me of a rocket slowing down its decent to Earth.
As it got closer it was a rectangular object with a Real White Bright bottom that lit up the whole bottom of Object.
I could not see the top of the object only the bottom.
I could only see it when it flashed.
The bottom was rectangular & the ends of the rectangle were on an angle tilted up from the bottom about 30 degrees.
When it got closer to Earth it slowed down & went North of my location.
No sound at all from such a big object.
I've seen objects in the Skies above my property Before but nothing like this.
I could relate this to anything I have ever seen in my life & I am 63!
First time I could say it maybe an Unidentified Aerial Phenomenon!
I see a lot of planes, Black Hawks, Chinook helicopters being fairly close to Grayling Military Base.
This was a UFO!