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The four sentences (labelled $1,2,3,4$) below, when properly sequenced would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer:

1. It also has four movable auxiliary telescopes $1.8 \; \text{m}$ in diameter.
2. Completed in $2006,$ the Very Large Telescope $\text{(VLT)}$ has four reflecting telescopes, $8.2 \; \text{m}$ in diameter that can observe objects $4 \; \text{billion}$ times weaker than can normally be seen with the naked eye.
3. This configuration enables one to distinguish an astronaut on the Moon.
4. When these are combined with the large telescope, they produce what is called interferometry: a simulation of the power of a mirror $16 \; \text{m}$ in diameter and the resolution of a telescope of $200 \; \text{m}.$