Black Holes and Uncle Albert by Prof Exors of Russell Stannard

Book Two in the bestselling Uncle Albert science/adventure series. Uncle Albert and his intrepid niece Gedanken make some astonishing discoveries when they set out on their next mission: to investigate the universe . . . Discover black holes that swallow up everything, tape measures that shrink when you take them downstairs, speeded-up time, and how it is that you are made of stardust in this adventure story set in deepest space.
Binding: Paperback / softback