Here's a breakdown of its composition:
* Hydrogen: About 75% of Sirius's mass
* Helium: About 25% of Sirius's mass
* Trace elements: Very small amounts of heavier elements like carbon, nitrogen, oxygen, and iron.
It's important to note that Sirius is a bit more massive and hotter than our Sun, so it burns hydrogen into helium at a much faster rate. This contributes to its higher luminosity and shorter lifespan compared to our Sun.