RT @SkyandTelescope: Learn how amateur astronomer Rick Johnson built his own observatory and compiled a catalog of an astounding 1,600 obje… 0 atbildes
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Mikus Porietis (2018-12-23 12:26:51) |
RT @SkyandTelescope: Learn how amateur astronomer Rick Johnson built his own observatory and compiled a catalog of an astounding 1,600 obje… | |