Stars are giant balls of hot gas that shine by burning hydrogen in space.
Stars are mostly made of hydrogen and helium.
They shine because of nuclear fusion in their cores.
The Sun is the closest star to Earth.
Stars form in clouds of gas called nebulae.
The temperature inside stars can reach millions of degrees.
Stars are very far away from Earth.
Some stars are much bigger than the Sun.
Others are much smaller, like white dwarfs.
Stars can live for millions or billions of years.
When they die, big stars can explode in a supernova.
A star’s color tells you its temperature.
Blue stars are the hottest, red stars are the coolest.
The biggest stars may become black holes.
Stars can be part of constellations (like Orion).
Our galaxy, the Milky Way, has billions of stars.
Some stars come in pairs (called binary stars).
The light from stars takes years to reach us.
A star’s life depends on its mass (how big it is).
Dying stars can also become neutron stars.
Stars are the building blocks of galaxies.
My Note
I learned Stars are giant balls of hot gas, they are mostly made out of hydrogen and helium, and when stars die, they can explode in a supernova.
![HOW TO ANALAYSE A PERSON, TO IF HE IS GOOD OR BAD. [MY EXPIRENCE]](https://static.wixstatic.com/media/338b83_3327cd5272eb4e17a1de3b1cab48e7a3~mv2.png/v1/fill/w_1024,h_578,fp_0.50_0.50,q_35,blur_30,enc_avif,quality_auto/338b83_3327cd5272eb4e17a1de3b1cab48e7a3~mv2.png)
![HOW TO ANALAYSE A PERSON, TO IF HE IS GOOD OR BAD. [MY EXPIRENCE]](https://static.wixstatic.com/media/338b83_3327cd5272eb4e17a1de3b1cab48e7a3~mv2.png/v1/fill/w_312,h_176,fp_0.50_0.50,q_95,enc_avif,quality_auto/338b83_3327cd5272eb4e17a1de3b1cab48e7a3~mv2.png)
The star’s core runs out of fuel and can’t support itself. Small stars become white dwarfs after expanding into red giants. Massive stars explode in a supernova, then become either neutron stars or black holes depending on how heavy their core is.
Scientists study the light from stars using spectroscopy. When starlight is split into a spectrum, each chemical element shows unique lines. By matching those lines to known elements, they figure out what the star is made of—even from light-years away.
It all depends on mass. Small stars become white dwarfs. Medium ones might go white dwarf or neutron star. Massive stars explode, leaving neutron stars. If the core is super massive, it collapses into a black hole due to extreme gravity.
Yes. New stars form in huge cold clouds of gas and dust called nebulae. Gravity pulls parts of the cloud together into clumps, which heat up and start fusion, becoming new stars. This still happens in regions like the Orion Nebula.
What happens to a star after it runs out of fuel?
How do scientists know what stars are made of even though they are light-years away?
Why do some stars end as black holes while others become white dwarfs or neutron stars?
Can new stars still form today? Where and how?
What would Earth be like if our Sun were a different kind of star, like a red giant or a blue supergiant?
keywords
Star
Light-year
Luminosity
Brightness
Temperature
Color (blue, white, yellow, red)
Constellation
Magnitude (apparent/absolute)