Room with a bright light (such as an overhead light) that can also get dark (nearly pitch-black works best) Markers, pencils and pens of different colors and a bag to carry them in A volunteer or ...

Small imperfections in a wine glass or tiny creases in a contact lens can be tricky to make out, even in good light. In almost total darkness, images of such transparent features or objects are nearly ...

For example, our pupils might constrict just before we turn on a light in a dark room to prepare us for the resulting glare. PNAS DOI: 10.1073/pnas.1909959116 Topics: ...

Everything in space—from Earth and the sun to black holes—accounts for just 15% of all matter in the universe. The rest of ...

Zodiacal light over Padar Island, Indonesia. Caused by sunlight scattering off interplanetary dust, this faint glow is only visible to the human eye in very dark skies. Aumphotography/Getty Images ...

Despite making up most of the matter in the universe, dark matter doesn't interact with light. So how do astronomers know it is there? In April 2023, scientists from the Atacama Cosmology ...