"And based on the whole phenomenon of polluted white dwarfs and what we've learnt in the last few years, we know that there's a disc of material that must be feeding the star's atmosphere with this silicon-rich material, " he told BBC News.

BBC: 'Dirty' stars hint at Sun's future

Aside from this I did find there to be a more comprehensive selection of extra material complementing the movie on the second disc.

BBC: Dobby the house-elf

The neutron star's intense gravity raises fearsome tides on its partner's surface, tearing material off and pulling it into a disc around the neutron star.

ECONOMIST: The dizziest, giddiest stars

The DVD includes this material, plus an additional 81-minute disc of special features, many of which have never been seen before.

CNN: Behind the scenes: 'The Beatles Anthology'

Stars are the result of the gravitational collapse of huge clouds of gas and dust, whereas planets are thought to evolve by the accretion of the material left over from such collapses, which forms a rotating disc around the newly created star.

ECONOMIST: Twinkle, twinkle, giant planet

Material in the vicinity gets drawn in, and settles into a disc, called an accretion disc, that's constantly spiraling toward the black hole.

CNN: Black holes abound in early universe

It can be awkward to drop in on a client and then ask if you can use the machine's Remote Disc feature to wirelessly borrow the optical drive on one of the client's computers if he hands you material on a CD-ROM.

FORBES: Magazine Article