Each particle (or anti-particle) is associated with a spin, which reflects the number of times one needs to turn the particle until it looks the same. For example, a single-headed arrow must complete one complete revolution to look the same, giving it spin 1. A double headed arrow needs to only turn halfway to look the same, giving it spin 2.
Spin Term Timeline in A Brief History of Time
The timeline below shows where the term Spin appears in A Brief History of Time. The colored dots and icons indicate which themes are associated with that appearance.
...consistent with both the general theory of relativity and quantum mechanics. He showed mathematically how spin ½ works and predicted that electrons should have partners, antielectrons or positrons. This later lead... (full context)
Forces acting between matter particles are carried by the force particles—that is, those particles of spin 0, 1, and 2. Matter particles emit the force-carrying particles, which then change the particle’s... (full context)
...three types of particle called massive vector bosons carried this weak nuclear force, and are spin-1 particles. These particles only seem different at low energies, and at high energies they all... (full context)
...is the strong nuclear force. This holds the atom together. The gluon, a particle of spin 1, carries this strong nuclear force and interacts only with quarks and itself. This force... (full context)
Linde put forward the chaotic inflationary model in 1983, which said there would be spin-0 in certain regions that, “because of quantum fluctuations, would have large values in some regions... (full context)
...called supergravity. It combined the graviton, the gravity wave-carrying particle, with other particles with different spin. These were all considered different forms of one superparticle, which unified certain matter and force... (full context)