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Lunar nearside with major maria and craters labeled Earthshine reflecting off the Moon. The bright region at left is directly illuminated by sunlight, while the rest of the Moon is faintly lit by sunlight reflected off the Earth. Generally, the Moon can be viewed even with the naked eye, however it may be more enjoyable with optical instruments.
Mare Crisium is just visible from Earth with the naked eye as a small dark spot on the edge of the Moon's face. It is the site of the 21 July 1969 crash-landing of the Soviet Luna 15 probe, occurring the same day two Apollo 11 astronauts walked on the Moon.
With the naked eye observers could see only six stars in the Pleiades; through his telescope, however, Galileo was capable of seeing thirty-five – almost six times as many. When he turned his telescope on Orion, he was capable of seeing eighty stars, rather than the previously observed nine – almost nine times more.
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The dark and relatively featureless lunar plains, clearly seen with the naked eye, are vast solidified pools of ancient lava called maria. Volcanism on the Moon is represented by the presence of volcanoes, pyroclastic deposits and vast lava plains on the lunar surface. The volcanoes are typically in the form of small domes and cones that form ...
This idea dates back to pre-war naked-eye observations of moments of good seeing, which were followed by observations of the planets on cine film after World War II. The technique relies on the fact that every so often the effects of the atmosphere will be negligible, and hence by recording large numbers of images in real-time, a 'lucky ...
The formation of new craters is studied in the lunar impact monitoring program at NASA. [4] The biggest recorded crater was caused by an impact recorded on March 17, 2013. [5] [6] Visible to the naked eye, the impact is believed to be from an approximately 40 kg (88 lb) meteoroid striking the surface at a speed of 90,000 km/h (56,000 mph; 16 mi/s).
Peak viewing will occur between October 12-26. The comet will become the largest visible object in our solar system (after the moon, obviously).