Curated category
Light sources
- SupernovaA supernova is a powerful and luminous explosion of a star. This event occurs during the last evolutionary stages of a massive star or when a white dwarf is…
- SunThe Sun formed about 4.6 billion years ago from the collapse of part of a giant molecular cloud that consisted mostly of hydrogen and helium.
- StarA star is a luminous spheroid of plasma held together by self-gravity. The nearest star to Earth is the Sun, which provides daylight and appears as a disk…
- SunlightA photon born in the core of the Sun takes between 10,000 and 170,000 years to reach the surface. It changes direction every time it encounters a charged…