Astronomy

"Astronomy is a natural science that is the study of celestial objects (such as moons, planets, stars, nebulae, and galaxies), the physics, chemistry, mathematics, and evolution of such objects, and phenomena that originate outside the atmosphere of Earth, including supernovae explosions, gamma ray bursts, and cosmic background radiation. A related but distinct subject, cosmology, is concerned with studying the universe as a whole."
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Sometimes space looks like the deep ocean, then you remember it's all connected.
A look at the universe through Hubble Space Telescope
a small portion of the nebula star cluster NGC 2074, located 170,000 light-years away
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Orion Nebula in Oxygen, Hydrogen, and Sulfur Image Credit Copyright: César Blanco González The Orion Nebula spans about 40 light years is about 1500 light years away in the same spiral arm of our Galaxy as the Sun. The Great Nebula in Orion can be found with the unaided eye just below and to the left of the easily identifiable belt of three stars in the popular constellation Orion.The whole Orion Nebula cloud complex, will slowly disperse over the next 100,000 years.
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The Ghost Nebula, spanning two light-years, and 2000 light-years distant from Earth. Credit: Hubble Heritage Team
bt-images.net
This image from Nasa's Spitzer Space Telescope shows a stellar nursery containing thousand of young stars & developing protostars near the sword of the constellation Orion.
bt-images.net
The sky (or celestial dome) is everything that lies a certain distance above the surface of the Earth, including the atmosphere and outer space.