orbit around a star, be nearly spherical, and not share its orbit with other objects. Pluto lost its status as a planet in 2006 for failing to meet this last requirement

was the response in 1954 to the need for an efficient and lightweight energy source for space missions

are coated with a diamond-like carbon film that protected astronauts' visors from space dust

Sputnik 1, launched by the Soviet Union on 4 October 1957, marking the beginning of the space race in the midst of the Cold War with the United States

around 6,000˚C, although it is estimated that the core reaches 16 million degrees Celsius.

9.46 trillion kilometres! It is the length travelled by light in 365 days and is used to measure the distances between most celestial bodies

approximately 149 million kilometres on average, although it varies between 147 and 152 million kilometres because the Earth's orbit is elliptical

is more massive than the average star in its surroundings.

its temperature, its luminosity, and its color, as well as the way it will live and die.

Emilio Herrera, a military and aerospace engineer from Granada who, in 1935, created the ‘stratonautical diving suit’, a pressurised suit to be used in stratospheric flights