American Basin in southern Colorado's San Juan Mountains (© Blaine Harrington III/Alamy)

Gray seal pup resting on a beach in Blakeney National Nature Reserve, England (© Kevin Sawford/Getty Images)

Enhanced-color composite of the Caloris Basin, Mercury (© NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)

Enhanced-color composite of the Caloris Basin, Mercury (© NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)

Tolbachik volcanic complex on the Kamchatka Peninsula, Russia (© Egor Vlasov/Shutterstock)

Great Point Light on Nantucket Island, Massachusetts (© Cate Brown/Cavan Images)

Independence Day fireworks over the National Mall, Washington, DC (© Jon Bilous/Shutterstock)