That’s absolutely right; there’s no special origin point in space where the Big Bang began. However, there is a specific reference frame that the Big Bang occured in, which we can measure by looking at the redshift of the cosmic microwave background left over from it. The solar system is currently moving at around 600km/s relative to that.
Interestingly, this is actually an expanding reference frame due to the universe’s expansion, so two observers locally at rest relative to it will each see the other moving away.
That’s absolutely right; there’s no special origin point in space where the Big Bang began. However, there is a specific reference frame that the Big Bang occured in, which we can measure by looking at the redshift of the cosmic microwave background left over from it. The solar system is currently moving at around 600km/s relative to that.
Interestingly, this is actually an expanding reference frame due to the universe’s expansion, so two observers locally at rest relative to it will each see the other moving away.