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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.
Light pollution limits viewing of celestial sights, as in this night scene from Moscow. Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying, light-collecting optical instrument, such as a telescope or microscope, or eye protection.
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 that two Apollo 11 astronauts walked on the Moon.
The effect is subtle to the naked eye, from night to night, yet somewhat obvious in time-lapse photography. Lunar libration causes part of the back side of the Moon to be visible to a terrestrial observer some of the time. Because of this, around 59% of the Moon's surface has been imaged from the ground.
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).
The penumbra causes a subtle dimming of the lunar surface, which is only visible to the naked eye when the majority of the Moon's diameter has immersed into Earth's penumbra. [8] A special type of penumbral eclipse is a total penumbral lunar eclipse , during which the entire Moon lies exclusively within Earth's penumbra.
The outburst may remain visible to the naked eye for a couple of days before it begins to fade. Even after it dims, skywatchers will likely still be able to spot the eruption for around a week ...