Because it actuall IS brighter.
Alpha Centauri is a triple star system. Alpha Centauri A, B & C or Proxima Centauri. Alpha Centauri A & B are 4.37 light years from the Earth whereas Alpha Centauri C is 4.243 light years.
alpha centauri
Because it is still really far from earth
because sun is the only star that is close to earth
Technically speaking the closest star to Earth is the sun which is about 93 000 000 miles (150 million kilometers) away. After that the next nearest star is Alpha Centauri and it is 4.37 light years away from our sun.
Multiple questions. See related questions.
It looks smaller than the sun because it is much farther away.
Alpha Centauri B is about 4.37 light years away from our sun. One light year is about 5,878,625,373,183.61 (almost 6 trillion) miles away. So that means that Alpha Centauri B is about 25,689,592,880,812.38 (about 26 trillion) miles from our sun. If you look at it in kilometers one light year equals 9,460,730,472,580.8 km (about 10 trillion km). So that means that Alpha Centauri B is about 41,343,392,165,178.1 (about 41.5 trillion) kilometers away or about 41 petameters.
Look up the Wikipedia article, "Sirius", for more details. Briefly, it is: the brightest star in the sky (however, some planets, which also look like stars, are brighter); 8.6 light-years away; a double star; one of the components (Sirius B) was the first white dwarf to be discovered.
if you want to know this question go to www. sirius's size and barnard's star.comif you need facts.thanksLisa Adjouadi5th grade student
They would both be bright enough to be seen by, and probably too bright to look at
The Sun (Sol) has an apparent magnitude of - 26.74Siruis (Dog star) with an apparent magnitude of -1.47 (Brightest in the Northern Hemisphere)Canopus with an apparent magnitude of -0.72 (Brightest in the Southern Hemisphere)Arcturus with an apparent magnitude of -0.04 (Variable)Alpha Centauri A with an apparent magnitude of -0.01Vega with an apparent magnitude of 0.03Rigel with apparent magnitude of 0.18Procyon with apparent magnitude of 0.34Achernar with apparent magnitude of 0.50Betelgeuse with apparent magnitude of 0.58 (Variable)A lower number means more brightness. All of these are apparent magnitudes. If you mean intrinsic magnitude, the answers are somewhat different. Sirius and Alpha Centauri A are bright because they're close to us. Canopus, on the other hand, is much brighter, but also much further away (Sirius is about 8 light years away; Canopus is more than 300 light years away).Off subject:Some planets are brighter (in apparent magnitude) than stars; for example, when Venus appears in the sky, she is always the brightest object (after the Sun and the Moon). In fact, Venus is bright enough to be seen in the broad daylight, if you know where to look. Planets look like stars, but their movement between the stars can be detected if you observe them just for a few nights.