If you don't have access to binoculars or a telescope you might be able to attend a local astronomy society event to get a better look.
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Uniform regions (solid backgrounds, smooth gradients) get stored as large blocks. Detailed regions (edges, textures) get subdivided into smaller blocks. You end up with a compressed representation that preserves detail where it exists and simplifies where it can.
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04