If you are referring to Gamma Velorum (and a bunch of other variants), it is a binary star system (pulsar) about 800 light years away.
To view things from far away is called a binocular
200 kHz
1km
Indiana is connected to Michigan southwest of Michigan.
500 feet is roughly 10 percent of a mile away from something. This is because there are 5,200 feet in a mile.
Earth gets hit every day by gamma-ray bursts - from far, far away. Depending on how near the gamma-ray burst is, it may cause some serious damage.
Roughly 125 light years.
Sadr is the traditional name of Star Gamma Cygni located in the constellation Cygnus having distance of about 1800 light years from the Earth .
Alhena, more commonly referred to as Gamma Geminorum (or simply HR 2421 in the Bright Star Catalogue) is approximately 105 light years (32 parsecs) from Earth.
The closest red giant to Earth is a star named Gacrux (also called Gamma Crucis). It is 88 light years away from us and can be seen in the constellation of the Southern Cross.
No... No matter how far away the radioactivity will always be the Same and have the same effect
A gamma ray burst would certainly affect earth, depending on how far away it is. It could come from outside the solar system.
About 25 million miles away from earth.
very far
Gamma rays can travel furthest into a material which is why it is emitted in a nuclear bomb blast. In a supernova gamma rays are burst out in all directions. Gamma rays are so deadly all life on Earth could be annihilated because of a single supernova from as far as 7 light years away!
The galactic center is in the general direction of Sagittarius; there's a whole bunch of stars there that have the potential to emit gamma rays in the direction of Earth. It's not worth losing any sleep over, though; most of them are very, very far away.
It depends on how far the source is. Check out the site I linked below.