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The universe is everything we can touch, feel, sense, measure, or detect. It includes all of space and time, and everything that exists within it — stars, planets, galaxies, black holes, dark matter, and even the smallest particles. Our universe began about 13.8 billion years ago with a massive explosion known as the Big Bang. […]

  Animals are multicellular, eukaryotic organisms comprising the biological kingdom Animalia (/ˌænɪˈmeɪliə/[4]). With few exceptions, animals consume organic material, breathe oxygen, have myocytes and are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. Animals form a clade, meaning that they arose from a single