dark

1 - It has long been known that bats use ultrasonic beams to follow insects through the dark.

2 - Ancient Babylonian manuscripts, Dark Age chronicles and New Age prophecies, all speak of catastrophes striking the Earth with devastating consequences.

3 - Without Thomas Alva Edison, the world might still be a dark place.

4 - Despite its intense cold and dark nine-month winter, Antarctica supports an abundant wildlife.

5 - The collision of two galaxies provides the best evidence yet obtained of the invisible dark matter assumed to dominate the mass of the universe.