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Both stars are absolute beasts, blasting out fierce amounts of light, but across that astronomical distance their brilliance is diminished to naked-eye invisibility.

To understand what this means, you must first appreciate that a parsec is a measure of astronomical distance and that a megaparsec is the equivalent of a million parsecs.

It is a challenge to find a topic in astronomy that does not rely on the astronomical distance scale — a collection of methods applied in series to determine distances that are too large to be measured directly.

The foundations of the astronomical distance scale are trigonometric parallaxes for individual stars.

For science fiction writers ranged across the astronomical distance that separates Edgar Rice Burroughs and Kim Stanley Robinson, Mars has been a theatre of dreams, variously realistic.