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Even during a partial eclipse, it is never safe to look directly at the Sun with the naked eye as it can cause eye damage, including blindness.

Though he admits comparing reports from recent years has got easier due to mobile phone and digital cameras being more sensitive to capturing the aurora than the naked eye.

Most are expected to be visible to the naked eye, though not all seven.

Four of the planets - Mercury, Venus, Jupiter, and Mars - will be visible to the naked eye.

Predicting whether a snowy hillside might slide depends on a dizzying array of factors, most of which are not obvious to the naked eye.