What is a Nebula?

Carina Nebula
Nebula are huge clouds of gases. Carina Nebula photographed by Hubble Telescope

Sky is full of interesting objects, one of which is nebula. You must have seen the beautiful images of nebulae like Crab Nebula, Orion Nebula, and Ring Nebula etc. These objects are named so differently because of their unique appearances which sometimes look like animals, eyes, rings and other familiar objects. Have you ever wondered what these beautiful structures are? How does such amazing structure form? Continue reading “What is a Nebula?”

Why do inner planets of our solar system have negligible hydrogen in the atmosphere?

The Planet Earth
The atmosphere of Earth has negligible hydrogen gas.
( Image Credit: NASA)

The atmosphere of Earth has 78% Nitrogen and 21% oxygen but no Hydrogen gas. Mercury¬†does not have atmosphere whereas Venus and Mars have an abundance of Carbon Dioxide. This indicates an absence of Hydrogen gas in the atmosphere of inner rocky planets of our solar system. Continue reading “Why do inner planets of our solar system have negligible hydrogen in the atmosphere?”