# How do you calculate lifetime of a star?

## How do you calculate lifetime of a star?

To find the lifetime in years of a Main Sequence star, multiply the ratio of the star’s mass and luminosity in solar units times approximately 1010 years. or about 4.9 million years. or about 692 billion years, which is many times the age of the Universe.

How long does an M star last?

Star classification

Class Temperature Approximate main-sequence life span (years)
F 6,000–7,500 K ~5 billion
G 5,000–6,000 K ~10 billion
K 3,500–5,000 K ~50 billion
M 2,000–3,500 K ~100 billion

### How does mass relate to lifetime of a star?

A star’s mass gives a measure of the amount of “fuel”, and its luminosity gives a measure of the rate at which this “fuel” is consumed by nuclear burning, so a star’s lifetime is proportional to its Mass divided by its Luminosity.

Are M stars rare?

O and B stars are uncommon but very bright; M stars are common but dim.. An easy mnemonic for remembering these is: “Oh be a fine guy/girl, kiss me.” The Hertzsprung -Russell (H-R) Diagram is a graph that plots stars color (spectral type or surface temperature) vs. For these stars, the hotter they are, the brighter.

## What is the lifetime of Sun?

Our estimate of the lifetime of the Sun is therefore 10 billion years. Since we know that the Sun is approximately 4.6 billion years old, the Sun is currently just under halfway through its stable lifetime.

What color of star lives the longest?

red dwarfs
The stars with the longest lifetimes are red dwarfs; some may be nearly as old as the universe itself.

### Can you predict what the lifetime of a star of ten solar masses is?

Lifespans for main sequence stars have a vast range. Whilst our Sun will spend 10 billion years on the main sequence, a high-mass, ten solar-mass (10MSun) star will only last 20 million years (2.0× 107 years) on the main sequence.