+-------------------------------------------------+ | | | | | | | || | | M | B | A | F | G | K | M || All | |-------+----+----+-----+-----+-----+-----++------| | | | | | | | || | | - 4 | .. | .. | .. | .. | .. | 1 || .. | | - 3 | .. | .. | .. | .. | .. | .. || .. | | - 2 | 1 | 4 | 1 | 7 | .. | 2 || 15 | | - 1 | 2 | 7 | 7 | 28 | 15 | 4 || 63 | | - 0 | 3 | 10 | 6 | 32 | 40 | 10 || 91 | | + 0 | 1 | 11 | 6 | 7 | 14 | 11 || 50 | | + 1 | 1 | 3 | 20 | 9 | 4 | 1 || 38 | | + 2 | .. | 5 | 48 | 26 | .. | 1 || 80 | | + 3 | .. | 1 | 32 | 36 | 2 | .. || 71 | | + 4 | .. | 1 | 5 | 25 | 25 | .. || 56 | | + 5 | .. | 1 | .. | 6 | 25 | .. || 32 | | + 6 | .. | 2 | .. | 3 | 10 | .. || 15 | | + 7 | .. | 1 | .. | .. | 14 | .. || 15 | | + 8 | .. | .. | .. | .. | 3 | 7 || 10 | | + 9 | .. | .. | .. | .. | 2 | 4 || 6 | | +10 | .. | .. | .. | .. | .. | .. || .. | | +11 | .. | .. | .. | .. | .. | 1 || 1 | |-------+----+----+-----+-----+-----+-----++------| | Total | 8 | 46 | 125 | 179 | 154 | 42 || 554 | +-------------------------------------------------+ In the distribution of all the parallax stars we once more find a similar bipartition of the stars. Arguing from these statistics some astronomers have put forward the theory that the stars in space are divided into two classes, which are not in reality closely related. The one class consists of intensely luminous stars and the other of feeble stars, with little or no transition between the two classes. If the parallax stars are arranged according to their apparent proper motion, or even according to their absolute proper motion, a similar bipartition is revealed in their frequency distribution.