The Milky WayThe Milky Way is the galaxy that contains our solar system. It is a spiral galaxy made up of billions of stars, planets, gas, dust, and dark matter, all held together by gravity. The Milky Way is so vast that it would take about 100,000 years for light to travel across it. Understanding our galaxy helps scientists learn about the structure of the universe and the formation of stars and planets.Science and Engineering Practices (SEP): Analyzing and Interpreting DataAstronomers use...

GalaxiesA galaxy is a massive system of stars, gas, dust, and dark matter held together by gravity. The universe has billions of galaxies, each containing millions or even trillions of stars. Galaxies come in different shapes and sizes, including spiral, elliptical, and irregular forms. Our own galaxy, the Milky Way, is a spiral galaxy that contains our solar system. Studying galaxies helps scientists understand the universe's structure and how it has evolved over billions of years.Science and...

Main Sequence Star LivesA main sequence star is a star in the most stable phase of its life cycle. During this stage, the star generates energy by fusing hydrogen nuclei into helium nuclei in its core. Our Sun is a main sequence star. These stars vary in size and temperature, ranging from small, cool red dwarfs to large, hot blue giants. Understanding the lives of the main sequence stars helps scientists learn how stars produce energy and how they eventually evolve into different types of...

Star ClusterStars are not always found alone in space. Many stars form in groups called star clusters, which are collections of stars that share a common origin and move together through space. There are two main types of star clusters: open clusters and globular clusters. Open clusters contain young, bright stars and are loosely packed, while globular clusters are tightly packed groups of older stars. Studying star clusters helps scientists understand how stars form, evolve, and interact with...

Red Giants And White DwarfsStars go through different stages in their life cycles. After spending millions or even billions of years as a main sequence star, they begin to change. When a star exhausts its hydrogen fuel, it expands into a large, cooler red giant that glows reddish. Eventually, the outer layers drift away, leaving behind a white dwarf, a small, hot, and dense core. Understanding red giants and white dwarfs helps scientists learn how stars evolve and what happens at the end of...

Star ConstellationsA star constellation is a group of stars that form a recognizable pattern in the night sky. For thousands of years, people have named constellations, using them to tell stories, navigate, and mark seasonal changes. Different cultures have their constellations, but today, astronomers officially recognize 88 constellations that help map the sky. Some well-known constellations include Orion, Ursa Major, and Scorpius.At night, we see different constellations at different times of...