“Because there is a law such as gravity, the universe can and will create itself from nothing. Spontaneous creation is the reason there is something rather than nothing, why the universe exists, why we exist,” Hawking writes.

http://www.phenomenica.com/2010/09/hawking-god-did-not-create-universe.html

but another question is why our universe has laws of physics?

Because there is a law such as gravity, the universe can and will create itself from nothing. Spontaneous creation is the reason there is something rather than nothing, why the universe exists, why we exist,

Hawking writes.

http://www.phenomenica.com/2010/09/hawking-god-did-not-create-universe.html

but another question is why our universe has laws of physics?