https://padlet.com/ericattwood1/41yidemhdw167x65 en-us 2021-04-19 00:49:59 UTC 2025-10-10 16:01:57 UTC hello@padlet.com ericattwood1 https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1430993963 The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

]]> 2021-04-19 01:18:34 UTC https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1430993963 ericattwood1 https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431015266 The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve.]]> 2021-04-19 01:27:22 UTC https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431015266 ericattwood1 https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431021385 Formation. When the solar system settled into its current layout about 4.6 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Like its fellow terrestrial planets, Earth has a central core, a rocky mantle and a solid crust.]]> 2021-04-19 01:29:44 UTC https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431021385 ericattwood1 https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431024324 The Milky Way was formed 10 Billion years ago. Astronomers believe that our own Milky Way galaxy is approximately10 billion years old. The newest galaxy we know of formed only about 500 million years ago.]]> 2021-04-19 01:30:53 UTC https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431024324 ericattwood1 https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431035429 Formation. The Sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust called a solar nebula about 4.5 billion years ago. As the nebula collapsed because of its overwhelming gravity, it spun faster and flattened into a disk.]]> 2021-04-19 01:35:18 UTC https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431035429 ericattwood1 https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431040468 First Dinosaurs. Approximately 228 million years ago, during the Triassic Period, the dinosaurs appeared, evolved from the reptiles. Plateosaurus was one of the first large plant-eating dinosaurs, a relative of the much larger sauropods.]]> 2021-04-19 01:37:24 UTC https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431040468 ericattwood1 https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431043558 Humans first evolved in Africa, and much of human evolution occurred on that continent. The fossils of early humans who lived 1.8 million years ago come entirely from Africa. Most scientists currently recognize some 15 to 20 different species of early humans]]> 2021-04-19 01:38:44 UTC https://padlet.com/ericattwood1/41yidemhdw167x65/wish/1431043558