The Orion Molecular Cloud Complex

The Orion Molecular Cloud Complex (or, simply, the Orion Complex) is a large group of bright nebulae, dark clouds, and young stars in the Orion constellation. The cloud is between 1 500 and 1 600 light-years [ … ]

What is the Space Launch System (SLS)?

The Space Launch System (SLS) is an American Space Shuttle-derived heavy expendable launch vehicle. It is part of NASA’s deep space exploration plans including a manned mission to Mars.   What is the Space Launch System (SLS)? [ … ]

Do you know what is the horizon?

The horizon or skyline is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth’s surface, and those that do not. What is the [ … ]