196 reputation
4
bio website kypselia.com
location European Union
age
visits member for 3 years, 7 months
seen Aug 2 at 19:25

Freelance Apple technologies consultant and iOS developer based in Western Europe.

Former PhD student in Astrophysics.


Sep
24
awarded  Autobiographer
Apr
28
awarded  Editor
Apr
28
revised How is distance between sun and earth calculated?
improved presentation
Jan
11
comment Why do we say that the earth moves around the sun?
Actually, ‘move around each other’ is a misleading phrase. They don't move around each other (in the sense, the Sun moves around the Earth and the Earth moves around the Sun), they move around their barycentre. Caution about language-induced pitfalls!
Jan
11
comment Why do we say that the earth moves around the sun?
A much more scientifically correct answer that Lubos', imho. Thanks for posting it.
Jan
16
comment Are scientists missing the point with distant cosmic objects, or is it just me?
Actually, saying that any galaxy is X billion lightyears away is a misnomer. Because, due to the expansion of the universe, you can't translate its age to its actual distance (as in metres). Heck, it doesn't even make sense to speak of an actual distance because, as pointed by Spencer Nelson, there is no more simultaneity at these scales. You can't figure out where the object "currently" is. The only thing you can say is that it is so far that its light has taken X billion years to arrive.
Jan
16
awarded  Supporter
Feb
15
awarded  Teacher
Feb
15
answered How is distance between sun and earth calculated?