How big, how hot (color/amount of energy emitted), how far, light pollution at viewing site
a teliscope
Stars look brighter than others due to factors such as their size, temperature, and distance from Earth. A larger and hotter star will appear brighter, as will a star that is closer to us. The brightness of a star as seen from Earth is measured by its apparent magnitude.
When there is little light like during night time, we can see the stars more clearly. This makes them look brighter and hence, larger.
moon is too nearer to earth than stars
Those stars are too far away for us to see them individually, but their combined light makes part of the night sky look brighter.
The sun appears bigger and brighter than other stars because it is much closer to Earth - only about 93 million miles away. Other stars are much farther away, making them appear much smaller and dimmer in comparison. Additionally, the sun is a relatively large and bright star compared to many others in the universe.
Look up in the sky and you will see. Polaris is actually quite dim, compared to other stars and planets. Even at it's dimmest, Mars is brighter than Polaris.
The sun appears bigger and brighter than other stars because it is much closer to Earth compared to the distant stars. Stars are actually suns, but they look tiny and faint because of their immense distance from us.
No, The earth does not have stars. Stars are like the sun. They are so far away that they do not look bright to us. Look at car headlights. When a car is far away, its headlights seem dim. They get brighter as the car gets closer.
Stars appear brighter if they are closer to Earth, have a higher intrinsic luminosity, or if they emit more light in the visible spectrum. Factors like size, temperature, and age can also impact how bright a star appears to us. Additionally, the presence of dust, gas, or other objects in space can affect how much of a star's light reaches us.
because the sizes and the distances away from earth are different
"Luminous" in this context means "bright" - how much light (or how much energy in general) does the star emit. Note that stars look dim to us only because they are far away - some of them are actually several times brighter than our Sun, in absolute terms. That is, if you would see several stars, and our Sun, at a same standard distance, some stars would be dimmer, but others would be brighter, than our Sun.