Daily Learning 1

 Universe has mass and light. We can see certain objects such as planets, moons, sun, stars, galaxies etc through our eyes or advanced telescopes. These heavenly bodies are huge. However 85% of the mass of universe is hidden in something invisible called as Dark Matter

Element Helium was first seen in Spectrum signature of Sun rays and later discovered in laboratory. It's name is derived from the Greek word 'Helios' (the Sun)

Source : astrophysics-for-people-in-a-hurry