# Dwarf planets | Science | THE COUNTRY

In the sequence 0.4, 0.7, 1, 1.6,…, 5.2, 10, 19.6, that, as we saw last week, corresponds with remarkable precision with the successive distances of the planets to the Sun expressed in astronomical units, the missing term between 1.6 and 5.2 is 2.8. This sequence is obtained by dividing the successive values of n + 4 by 10, where n successively takes the values 0, 3, 6, 12, 24… Thus, for n = 0, (0 + 4): 10 = 0.4, which is the distance from Mercury to the Sun in UA.

This sequence was discovered by the German astronomer Johann Titus in 1766, was included by Elert Bode in his prestigious astronomy books (which is why it is known as the Titus-Bode Law) and stimulated the search for a new planet at a distance of 2.8 AU of the Sun, then, as Titus himself said, the Creator could not have left that gap empty. And, as we saw a couple of weeks ago, that search led to the discovery of the first object found in the asteroid belt: the dwarf planet Ceres, discovered in 1801 by the Italian astronomer Giuseppe Piazzi.

The issue of space mining sparked a lively debate (see comments from last week), and our “outstanding user” Manuel Amorós proposed, in this regard, the following problem:

10 speakers attend a Space Mining Congress. In any group that can be formed from 3 of them, there are at least two that are not known. Prove that there is a group of at least 4, where nobody knows each other.

### The six dwarfs

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