Sun





Taken on a cloudy day, this is a picture of the sun filtered through clouds. Sunspots are visible on the photosphere of the sun. Sunspots can be as small as 10 miles or as large as 100,000 miles in diameter. In comparison, the earth has a diameter of only 7,926 miles (approximately).



Partial eclipse of the sun, 2017











The first astronomical object to be photographed was the moon in 1840.





Landmarks on the moon: The Sea of Tranquility (Mare Tranquillitatis), the Apollo 11 Landing Site, the Copernicus crater and the Tycho crater.









The moon and Mars



Lunar eclipse



Constellations



Named after a hunter named Orion in Greek mythology, the Orion constellation is one of the most recognizable constellations in the night sky. Orion's seven brightest stars form a distinctive hourglass-shaped asterism, or pattern, in the night sky. Four stars—Rigel, Betelgeuse, Bellatrix and Saiph—form a large roughly rectangular shape.

In the center are the three stars of Orion's Belt—Alnitak, Alnilam and Mintaka. Descending south from the 'belt' is a smaller line of three stars (the middle of which is in fact not a star but the Orion Nebula)

The Orion Nebula is the closest region of massive star formation to Earth. The nebula has revealed much about the process of how stars and planetary systems are formed from collapsing clouds of gas and dust. Astronomers have directly observed protoplanetary disks, brown dwarfs, intense and turbulent motions of the gas, and the photo-ionizing effects of massive nearby stars in the nebula.



The Big Dipper (constellation Ursa Major) can be seen to follow the rough outline of a large ladle or dipper. The pointer stars of the Big Dipper can be used to find the North Star - Polaris.







Copyright © Oproot Research. All rights reserved. Permission is granted for limited, non-commercial use of these images. If used, please credit and notify Oproot Research. If circumstances permit, please include the URL: http://www.oproot.com. Oproot Research would appreciate a copy of publication. High-resolution images are also available. Please email requests, comments to tech@oproot.com.