Because they are closer or actually brighter.
There are a lot of these. They are mainly the "Red Giant" and "Red Supergiant" stars.
A dwarf star is denser than a giant star. Dwarf stars have a higher density due to their smaller size and higher mass compared to giant stars. Giant stars have larger volumes and lower densities as they have expanded and become less dense towards the end of their life cycle.
Stars appear brighter or dimmer depending on their distance from Earth. The closer a star is, the brighter it appears, while stars that are farther away appear dimmer. Additionally, stars can also vary in brightness due to changes in their own luminosity or if they are being obscured by interstellar dust or gas.
The five main groups of stars are main sequence stars, giant stars, supergiant stars, white dwarf stars, and neutron stars. These groups are classified based on their size, temperature, and stage in their life cycle.
Stars appear brighter depending on their size, temperature, and distance from Earth. Larger and hotter stars emit more light, making them appear brighter. Additionally, stars that are closer to Earth will appear brighter than those that are farther away.
'Appear' would become 'appeared' in the past tense so the sentence would simply be 'some stars appeared to be brighter than others'.
The brightness of stars varies because of many reasons. 1. The Distance. Some Stars are far away, and the light takes longer to reach us, so the star only appears to be darker then stars around it that may appear brighter. 2.The size. Some stars are massive, and appear brighter then others simply due to their size. 3. It isn't a star. what you may be looking at isn't a star. You may be seeing a satellite, quasar, or even a close white dwarf or neutron star. 4. Finally, you may be looking at the milky way. in which case, they all appear to be brighter then stars outside it. This also falls under distance.
when Dwarf Stars run out of hydrogen they form Red Giant stars, then from that they become White dwarf stars when the outer layers shed, forming a planetary nebula.when giant stars or supergiant stars run out of hydrogen they form red supergiant stars
A stars evolution. Our Sun will go yellow dwarf -> red giant -> white dwarf -> black dwarf.
red giant
Planets appear brighter than stars because they reflect more sunlight and have larger apparent sizes in the night sky compared to distant stars. Stars emit light due to nuclear fusion in their cores, while planets reflect light from the Sun, making them appear brighter to us on Earth.
A giant star is a dying star that expanded, and the core shrinks are the same time. When the shell of the giant star drift into space as planetary nebula, the core became a white dwarf. The white dwarf is made from the core of the giant star.