Astronomy | Definition, History, Discoveries, & Facts | Britannica
Astronomy, science that encompasses the study of all extraterrestrial objects and phenomena. Since the late 19th century, astronomy has expanded to include astrophysics, the application of physical and chemical knowledge to an understanding of …
Astronomy - Wikipedia
Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, meteoroids, asteroids, and comets.
Solar System Exploration - NASA Science
Solar System Overview. Our solar system has one star, eight planets, five officially named dwarf planets, hundreds of moons, thousands of comets, and more than a million asteroids. Get Solar System Facts. Featured Story. Could Life Exist Below Mars …
Sky & Telescope | Astronomy News, Tools & Resources - Sky
Sky & Telescope covers the latest night-sky events, astronomy news, astrophotography and observing tips. Learn more with our tools, videos, and podcasts.
NASA Astrophysics - NASA Science
The universe is everything. It includes all of space, matter, energy, time, and you. NASA’s Astrophysics Division is dedicated to exploring the universe, pushing the boundaries of what is known of the cosmos, and sharing its discoveries with the world.
Astronomy: Everything you need to know | Space
2023年7月25日 · Astronomy is one of the oldest scientific disciplines that has evolved from the humble beginnings of counting stars and charting constellations with the naked eye to the impressive...
Stars - NASA Science
Stars are giant balls of hot gas – mostly hydrogen, with some helium and small amounts of other elements. Every star has its own life cycle, ranging from a few million to trillions of years, and its properties change as it ages.
Astronomy - Science News
5 天之前 · Cosmology. Astronomy. Runaway stars could influence the cosmos far past their home galaxies. Dozens of stars fleeing a neighbor of the Milky Way suggest these escapees could have an outsized...
Nature Astronomy
2024年9月27日 · Nature Astronomy publishes research, reviews and commentary of the highest quality in all areas of astronomy, astrophysics, planetary sciences.
What is Astronomy? | AMNH - American Museum of Natural History
Astronomy is the study of everything in the universe beyond Earth’s atmosphere. That includes objects we can see with our naked eyes, like the Sun, the Moon, the planets, and the stars. It also includes objects we can only see with telescopes or other instruments, like …