They’re the eyes of something that isn’t known but exists anyway; like the green eye of the radio; like the eyes of aliens from a distant planet.
Cat's Eye
The inhabitants of the planets of distant stars witness quite different constellations in their night skies than we do in ours—other Rorschach tests for other minds.
Cosmos
The assumption was that any extraterrestrial intelligence capable of receiving the message would recognize the maths and the science and quickly make sense of the Earth-specific information.
The Invention of Science
“And if there were anything these Ekumens wanted from us, they wouldn’t have sent you alone. It’s a joke, a hoax. Aliens would be here by the thousand.”
The Left Hand of Darkness
secret information about an enemy or potential enemy
Washington wanted a special operations unit made up of volunteers who could both fight and gather intelligence “by water or by land, by night or by day.”
George Washington, Spymaster
an optical device that produces an intense beam of light
Today we combine a laser and a photocell, or a radar transmitter and a radio telescope, and in this way make active contact by light with distant objects.
Cosmos
the phenomenon of rising as if by supernatural means
The Christian churches could not abandon their belief in miracles and angels, but Christians could certainly retreat from their insistence on the reality of witchcraft, demonic possession, poltergeists, levitation and second sight.
The Invention of Science
"The worst cases cause mutation. Some might grow boils or develop black lumps, but others suffer from warped bones and muscles—even their skulls change shape, and new limbs grow where they shouldn't."
City of the Plague God
the path of a celestial body in its revolution about another
In orbit, to fly faster you have to fly lower, so the further behind the lunar module was, the lower the orbit it would aim for.
Flying to the Moon: An Astronaut's Story
"I am trying to explain to you," Miss Honey said patiently, "that we are dealing with the unknown. It is an unexplainable thing. The right word for it is a phenomenon. It is a phenomenon."
Matilda
measuring instrument using pulses of microwave radiation
But with radar equipment, it’s possible to send out radio signals that bounce off another object and return to the sender—revealing where that object is.
A Thousand Sisters
the act of spreading outward from a central source
If the universe were expanding faster in some directions than in others, the intensity of the radiation in those directions would be reduced by an additional red shift.
A Brief History of Time: And Other Essays
any celestial body orbiting around a planet or star
Their rockets had reached speeds of Mach 15 in flight, and they were confident of their abilities to lift a payload—a satellite and a human passenger—into orbit.
Hidden Figures
a star that explodes and becomes luminous in the process
The stars then exploded as supernovas, and their debris went to form other stars and planets, among them those of our Solar System, which is about five thousand million years old.
A Brief History of Time: And Other Essays