In the vast depths of the universe, a gravitational ballet lasting hundreds of millions of years is unfolding. Two black ...

In the vast depths of the universe, a gravitational ballet lasting hundreds of millions of years is taking place. Two black holes spiral towards each other under the influence of their mutual gravity, ...

This paper document is in a plastic folder with metal bindings. For related accession, see 314462. overall: 4 cm x 31 cm x 44.5 cm; 1 9/16 in x 12 7/32 in x 17 17/32 in ...