HELPING THE OTHERS REALIZE THE ADVANTAGES OF SOLAR SYSTEM, MILKYWAY GALAXY,EARTH, ENVIRONMENT, ECOSYSTEM, PHYSICS, SCIENCE,

It’s tough to explain to how far away a cosmic item certainly is — brilliant-looking stars might be intrinsically dim but near, even though faint-looking stars may be intrinsically vivid but distant. But many of the Cepheids within the similar cloud should be about the same length from Earth. That intended “their durations are evidently linke