- Astronomy is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, meteoroids, asteroids, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond Earth’s atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole.
Now let me be clear: I suffer no illusions about Saddam Hussein. He is a brutal man. A ruthless man. A man who butchers his own people to secure his own power.… The world, and the Iraqi people, would be better off without him. But I also know that Saddam poses no imminent and direct threat to the United States, or to his neighbors…and that in concert with the international community he can be contained until, in the way of all petty dictators, he falls away into the dustbin of history.
Barack Obama, Remarks Against Going to War with Iraq (2 October 2002)