Science Mysterious object just 4,000 light years away from Earth releases a giant burst of energy

[Lanny]

Ok

Saturn is a light hour away

Uranus is about 2.5

Neptune is about 4

And Pluto though it's now considered a dwarf planet is about 5

Uranua and Neptune are only 1/4 of the solar system's planets and Saturn is not two or more light years away. Pluto is not really a planet.

 

[Lanny]

Since an object with mass can't travel at light speed you would experience time. Just a lot less at near light speed. Walking on near light speed train would not be more than light speed. Light does not "experience" time. It is counter intuitive.

Light has an effective mass but not a static mass.
One of the guys that I graduated with while we both worked at Tektronix was on a team that measured the effective mass of a photon (the name I gave to my old '69 Volvo four banger). The effective mass of a photon was measured to be ~1/3 of what they previously thought it was.
By the way, the tilde (~) in science and engineering means 'approximately'. I'm certainly not saying this for a highly scientific crandc but rather for the general reader.

 

[crandc]

Time slowing down the closer you get to the speed of light explains why you can't exceed the speed of light.

And mass increases to infinity so it takes more energy to accelerate the velocity of an object with resting mass.