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.
1 The nearest star to our solar system is Proxima Centauri which is 4.2 light years away.  The Sun is part of a single star system but there are also binary and multiple stars where two or more stars orbit around each other.