It is in the constellation gamma Cetus

It is a double star- Sirius A and Sirius B

 Another name for it is HP108248

It is a double star

It is in the constellation Canis Major

 It is the 13th brightness star seen from Earth

It is also a fixed star

Sirius has the same length of year as us

Acrux lies in the middle of the Milky Way

 Its orbit is 320 years

It is 8 light years away from the Earth

It is a triple star

 Its double stars are yellow and blue

It is the 2nd brightest star

 It is in the constellation Crux



1. How do you measure the brightness of stars?

1.Flux-rate of energy



Scientists use a photometer to measure the brightness of the stars.

2. What is the diameter of the sun?

1,392000 km (864,938 miles)

3. What are the three closest stars to earth?

Proxima Centauri, Alpha Centauri, Barnard's stars