The evidence for the age of the Sphinx is not only that it is aligned with Leo rising for 10,500 BC, but also that the erosion on the body of the Sphinx can only be attributed to rainfall, which did not occur in the region much after 10,500 BC.
Proxima Centauri (from Latin, meaning nearest [star] of Centaurus) is a red dwarf, a small low-mass star, about 4.25 light-years from the Sun in the constellation of Centaurus.
The nearest star is about 24 trillion miles away. That is 24,000,000,000,000 miles. If a scientist wanted to do a math problem with that huge number it would be very difficult. To make this number smaller we use something called light years.