At the center of most large galaxies, including our own Milky Way, sits a supermassive black hole. Interstellar gas ...

IN a paper on secondary radiation from gases subject to X-rays (Phil. Mag. [6] v., p. 685, 1903), I described experiments which led to the conclusion that this radiation is due to what may be ...

NASA astronauts are returning to Earth after nine months in space. Experts have said a prolonged period in space can come ...

meaning snow cover reflects between 40% to 90% of the radiation (light and heat) coming in from the sun. This is why a snow-covered field is so bright on a sunny day and also why snow cover makes ...

Some of this infrared radiation is transmitted through the atmosphere back out into space, and some is absorbed by greenhouse gases in the atmosphere. The greenhouse gases emit infrared radiation ...

The warm Earth emits infrared radiation. Some gases absorb this radiation and re-emit it in all directions.