A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
- Quark
- one of the most basic subatomic building blocks of matter. Quarks combine to form protons and neutrons, as well as other more exotic particles.
- Quark Epoch
- the period in the early Universe where matter existed, but only as a hot dense “soup” of quarks, gluons and a few other elementary particles.
- Quasar (quasi-stellar radio source)
- an active galaxy so distant it appears star-like.
- Quiescent
- at rest; inactive.