Sirus B is a White Dwarf star orbiting the bright star Sirius A in the constellation Canis Major, located about 8.6 light-years from Earth. Practically our neighbour. It is almost as big as earth, with a 12,000 km Diameter.
Galaxies, even the small ones, are an order of magnitude bigger than Earth (which is 12,742 km in diameter). Seque 2, one of the smallest known galaxies and a satellite of the Milky Way located approximately 114,000 light-years away, is about 220 light-years in diameter.
Around 160 trillion Earths could fit side-by-side along the diameter of Seque 2.
Space is fun, scary and big.