Londoners - Interactive space museum in Docklands area?

[lecce]

We booked a weekend in London a couple of months ago. Hotel is in Docklands area and we googled nearby attractions and found, or at least I'm sure I remember we did, a Space themed museum that has interactive elements, quite near the hotel in Docklands.

Did we note down it's name? No. Did we save it to favourites? No. And now the mine-break looms, ds has been informed of said museum and we can't track it down. It has disappeared from Google.

Of course, we have other plans for our weekend away, but would really like to find this again if possible. Can anyone help??

Greenwich Observatory?

The Observatory has some bits and pieces but it is not huge.

The Science Museum in Kensington has also a gallery.

Planetarium and astronomy museum at Greenwich?
The Crystal, interactive technology exhibition by Siemens at Royal Victoria or the cable car?
The Big Bang fair at Excel? But that was only one week.