Stars
What are quasars
Quasars are very distant objects in space. They are relatively small objects that can be as bright as an entire galaxy. They are among the br
What is a pulsar
When a massive star explodes, it collapses into a small dense star. These neutron stars spin very quickly, and emit pulses of radio waves. When the
Sun's energy output and how we're protected from it
Nuclear reactions inside the Sun raise its temperature to millions of degrees. About 8 billion tons of material of the Sun is converted into energy
What's a Globular Cluster?
Globular cluster is a spherical collection of stars that orbits a galaxy as a satellite. Globular clusters are very closely held by gravity, which
Why stars cannot form on their own
It has been believed for some time that stars can form from a collapsing nebula. But is it actually possible? Let's look at processes that woul
How long did it take for light from the stars to reach us?
According to currently accepted models, light travels at the same speed in all parts of the universe, and it has always traveled at this speed. Dis
How many stars can be seen with an unaided eye?
The number of stars you see would, of course, depend on how bright your surrounding area is and how good your eye-sight is.. But under ideal dark s
The nearest star
One interesting fact about our nearest star, is that it's not just a single star, it's a multiple star system – two stars as bright a
What is the purpose of the Sun?
We are benefiting from the Sun in quite a few ways. Being at just the right distance from us, it is the source of energy for our planet, providing