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Re: Why Reboost

The ISS has many times the drag of Hubble due to it's larger cross 
sectional area. Hubble is also in a higher orbit so has significantly 
less drag. The recent high solar activity also increases the density 
of the Earth's atmosphere at the ISS altitude(yes there is still some 
atmosphere at that level).
The ISS is purposefully put in a lower orbit for several reasons one 
is that the orbit is self cleaning, IE everything at that level will 
come in eventually, it is also protected from radiation and it takes 
less fuel to put things there so we get better payload capacity from 
the launchers.
I hope this helps.
Lou McFadin
701 Deerwood Ave.
Orlando Fl. 32825
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