Black holes are invisible because their gravity well pulls in any light around it, but technically they're not stars. They are the collapsed cores of stars.
It means another object is covering the star, making it invisible.
Every visible star is an example of emitted light, regardless of how bright it seems. Several invisible ones are too, even though there are external reasons why they're invisible to us.
A short-period variable star.
It can seen vaguely and invisible under the microscope
As a planet revolves around a star, it actually wiggles the star a bit (the bigger the planet, the more it wiggles the star). This causes the star to be moving towards as a bit, then away from us a bit (and repeat forever). As a star moves away from us, the Doppler effect (also known as a redshift) makes the star appear a little redder and as a star moves towards us, it appears a little bluer. If we see a star, getting a little bluer, then a little redder, then a little bluer again and so on, you know that the star is wiggling, and that would only be caused if the star has something in its orbit, like a planet. So even though we can't see the planet, we know it is there.
It can be call 'Invisible Star' because it is invisible.
It means another object is covering the star, making it invisible.
The star that is so cool (cold) that it does not emit light and so is invisible.
The visible star and the invisible star will attract each other. As a result, both will revolve around their center of mass; this movement, observed in the visible star, indicates there is an invisible star.
An invisible boundary, probably.An invisible boundary, probably.An invisible boundary, probably.An invisible boundary, probably.
An invisible angle!
the invisible kind
An invisible quadrangle!
Sorry guys, but there really is no way to be invisible!! :( but keep trying to find it out ok bye
the kind that are invisible. its not a battery gun.
Every visible star is an example of emitted light, regardless of how bright it seems. Several invisible ones are too, even though there are external reasons why they're invisible to us.
No kind of star.