Toxic air pollutants are poisonous substances in the air that come from natural sources (for example, radon gas coming up from the ground) or from manmade sources (for example, chemical compounds given off by factory smokestacks) and can harm the environment or your health.
Subsequently, Scorpius X-1 was discovered in 1962 by a team, under Riccardo Giacconi, who launched an Aerobee 150 sounding rocket carrying a highly sensitive soft X-ray detector designed by Frank Paolini.
In July 2000, the familiar head of Scorpius sported a new look as its middle star, Dschubba (from the Arabic for the Scorpion's Forehead), suddenly and unexpectedly brightened from its usual magnitude 2.3 to 1.9.