About the orbit of stars, it is true that
Their orbits are all in the same plane
Their orbits are always around the biggest star
None of them
How can we know the age of a star cluster?
Observing its color
Observing its size
Observing the number of stars
In a globular cluster, what is the name of the part in which appears dispersed stars?
Core
Halo
How do we know globular are older than the other?
It is suppose they were the first bodies to form
Their biggest stars are smaller than the Sun
Why in globulars is less probable to find planets?
They do not contain heavy metals
They are very package
Both are correct