Getty Images
Emission nebula (NGC 6559), optical image.
Emission nebulae are clouds of gas and dust that are ionised by radiation from hot stars within them, causing them to glow red. Around the bright stars are regions of reflection nebulosity, where fine dust particles reflect the light of...
Getty Images
T/L film made from 16 years of exposures of the stars orbiting the black hole at the centre of the Milky Way galaxy.
Observations of the orbit of one star, S2, have provided the best evidence that our galaxy contains a central supermassive black hole, called Sagittarius A*. S2 has been observed for one complete orbit, just over 15.5 years, since 1995....
SciShow
Sci Show Kids: Constellations: Connect the Dots in the Sky!
Learn about how we connect the dots to make pictures with the stars in the night sky. [3:44]
Crash Course
Crash Course Kids 37.1: The Zodiac Constellations
Find out about a certain group of special constellations called the Zodiac which includes Gemini, Sagittarius, and Scorpio. [4:08]