Space
8th Grade Science · 10 lessons
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Lessons
- 1The Speed of Light in SpaceLight from the sun takes about 8 minutes to reach Earth. A light-year is the distance light travels in one year—about 9.5 trillion kilometers.Lesson
- 2Nebulae: Where Stars Are BornNebulae are clouds of gas and dust in space where new stars are born. When gravity causes a nebula to collapse, it heats up and nuclear fusion begins, forming a star.Experiment
- 3The Sun's Activity CycleThe sun goes through an 11-year cycle of activity. During solar maximum, more sunspots and solar flares occur, which can affect satellites and power grids on Earth.Lesson
- 4Dwarf Planets and PlutoPluto was reclassified as a dwarf planet in 2006 because it has not cleared other objects out of its orbit. Dwarf planets such as Pluto, Ceres, and Eris orbit the sun but are much smaller than the eight main planets.Lesson
- 5Black HolesA black hole is a region in space where gravity is so strong that not even light can escape it. Black holes often form when a very massive star runs out of fuel and collapses at the end of its life.Lesson
- 6The Big BangScientists believe the universe began about 13.8 billion years ago in an event called the Big Bang. Since then, space itself has been expanding, carrying galaxies farther and farther apart over time.Experiment
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