Neptune often looks slightly different in observations, as it has dark spots which appear periodically. But it can also be bright at times, as the observations of auroras there show: In the image ...

Plant responses to light are multiple. Light is an energy source, converted to sugars by photosynthesis. It is also a signal sensed by specific photoreceptors for red, blue and UV-B radiation.

Targeting magnetic nanoparticles to tumours then applying an alternating magnetic field can improve the contrast for infrared thermal imaging. Like inflamed tissues, malignant tumours have higher ...