There could be meteors hitting the atmosphere close to the speed of light
phys.org
phys.org
"Relativistic mass" is an outdated concept; it's really just another name for "total energy".
> does the increase in mass means size of just mass within the same size ?
I'm not sure what you mean. Objects traveling at relativistic speeds will be length contracted, so if anything their apparent "size" decreases.
In any case, as has been pointed out upthread, the speeds actually being observed are only about 1% of the speed of light, so relativistic effects are too small to matter.
Also, again, in the beginning it says "relativistic" and then switches to "sub-relativistic". I don't know exactly what the latter is, but surely it implies not relativistic?
> Despite having a sound theoretical basis, the question remains as to whether or not meteors larger than a grain of dust enter Earth's atmosphere at sub-relativistic or relativistic speeds. These would be meteors that measure 1 mm (0.04 in), 1 cm (0.4 in), or 10 cm (4 in) in diameter.
I mean, what, they're quantized?
Typical for phys.org. They're going for eyeballs and clicks, not accuracy.