How do the Sun and the Moon affect the Earth? Without the Sun, the Earth would be a big ball of frozen mud, just another asteroid, drifting in space with no gravity to anchor it here and nothing to give us heat and light. We could not be here without the Sun.
Or at least its harmful rays.
Spending the afternoon outdoors without sunscreen is asking for trouble now and way into the future. Burn marks are not attractive. Wrinkles--or worse yet, possibly skin cancer--will eventually be a problem if you don't protect your skin now. You will definitely need sunscreen so go ahead and get it now before you're spirited off on a picnic or a trip to the beach. Look for the SPF rating of at least 15 and also make sure it has UVA protection. Apply it half an hour before going out and reapply it after getting in the water or sweating.