@MSGID: 1@dont-email.me> 9d4b6896
@REPLY: 1@reader2.panix.com> 429dc08d
@REPLYADDR Jim Wilkins <muratlanne@gmail.com>
@REPLYTO 2:5075/128 Jim Wilkins
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"danny burstein"  wrote in message news:ub13d5$493$1@reader2.panix.com...

In 1@dont-email.me> "Jim Wilkins" <muratlanne@gmail.com> 
writes:

>Telescopes can detect only asteroids that are illuminated by sunlight on 
>the
>side facing us, meaning that any that approach Earth from the sun`s
>direction, on their way back out, may be invisible until they pass or hit.

It`s a bit trickier, but since these asteroids will also be
blocking out stars they pass in front of...

Keping track of that a century ago would have been
just about impossible, but I`d completely wild assed
guess that there are computerized algorithms and
telescopes doing this...  (plenty, make that PLENTY,
of defence/military reasons for tracking "black"
satellites...)
---------------------------------
https://www.livescience.com/space/asteroids/a-skyscraper-size-asteroid-flew-clos
er-to-earth-than-the-moon-and-scientists-didnt-notice-until-2-days-later

https://www.esa.int/Space_Safety/Planetary_Defence/NEOMIR_finding_risky_asteroid
s_outshone_by_Sun

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