Human eyes cannot perceive colours at night because cones, responsible for colour perception, are only activated under intense light conditions.

The number of species catalogued as fluorescent increases each day, and UV lights can help us to find some that are only active during the night, generating a wide range of creative resources to photograph them.

Using an external flash placed above the snake, accompanied by a high shutter speed, allowed me to freeze one of those chemosensory licks that the snake used to try to decipher its surroundings.

When a material gets wet, we see it with a darker colour. Professor Inmaculada Pascual Villalobos explains why.

When a large quantity of water is observed, as happens in the sea, we notice a blue color that can vary depending on the mass of water we are observing. Professor Inmaculada Pascual Villalobos explains why.

The sclera, known for its color as «the white part of the eye», is an opaque, resistant, and fibrous membrane that covers part of the eyeball, giving it shape and protecting its interior.

We call a mirage seeing objects where they are not. It is an optical illusion that can be seen on very hot days and in places like deserts. Inmaculada Pascual Villalobos explains this and tells us about the «Fata Morgana» effect.

The gamma-ray radiation represents the most energetic «light» of the electromagnetic spectrum.

Light can be considered from many points of view. Light is essential for the development of life on Earth, has determined animal and plant evolution, and has also a role in many aspects of culture and art.

ESA/Hubble & NASA Travelling at hyperluminal speeds would open to humanity the possibility of exploring the whole galaxy, and even, perhaps, other galaxies. In the image, the UGC 12158, photographed by the Hubble space telescope. It is believed to be a virtual twin of our own