Thread: Are We Alone ?
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Old May 17th 21, 03:27 PM posted to alt.astronomy
R Kym Horsell[_2_]
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Default Are We Alone ?

In alt.astronomy Michael F. Stemper wrote:
On 15/05/2021 23.55, Bast wrote:
wrote:
Amazing how the whole point of this thread continues to be missed,
that distances are FAR too great for any practical travel between
stars, even in the very unlikely event of traveling near light speed,
or of any communications. All experience so far has confirmed this.



You mean,......SO FAR
It was not that long ago the same thought about being impossible was said
about beng able to travel at speeds of over 30 miles per hour......


Was that said by physicists, or by newspaper writers?


Neither. Google is your friend.

Modern physicists on the other hand are starting to doube that anything
is really impossible. Quantum tunneling e.g. allows particles to
pass through regions where they should not "possibly" be able to pass.

Bur grade school science book writers that claim "nothing can go
faster than light" are in the position of quoting physics that otherwise
allows two points in spacetime to be connected directly and allow
zero transit time. Or allow space to expand at any speed and drag
anything "in" it along for the ride.

But I guess that stuff is written for kids. Like when jr grade school
textbooks say you cain divide a number by a bigger number or
subtract a bigger number from a smaller number.

You're meant to figure out later that that was just a bit of simplifying b/s.

--
[Surprise surprise surprise! The universe started from a dot 13 bn years
ago but has managed to grow to ~100 GLY across in that time -- apparently
4x faster than jr science textbooks say!]

The radius of the observable universe is therefore estimated to be about
46.5 billion light-years and its diameter about 28.5 gigaparsecs (93 billion
light-years, or 8.8?1026 metres or 2.89?1027 feet), which equals 880
yottametres.
Age: 13.799?0.021 billion years
Diameter: 8.8?1026 m or 880 Ym (28.5 Gpc or ...
Density (of total energy): 9.9?10-27 kg/m3 ...
-- wiki