  The Submillimetron is the international project of the space telescope for
astronomical studies at the submillimeter and infrared wavelengths using
facilities of the Russian segment of the International Space Station (ISS). The
concept of the telescope includes a 60 cm mirror cooled to liquid helium
temperature with a novel type of microbolometers arrays using effects of
superconductivity. This combination gives unique possibility to realize
background limited sensitivity in the spectral minimum of the extraterrestrial
background near frequency 1 THz between peaks of galactic dust emission and
CMB. The angular resolution about 1 arcmin, field of view about 1 degree, and
optics are similar to IRAS satellite, but the sensitivity is better on more
than order of magnitude for about 10^-18 W/Hz^-1/2. This improvement and
another spectral region permits to reveal in full sky survey considerably more
new astrophysical objects. The concept of free flying instrument with periodic
docking to ISS gives possibility to combine low cost with reliability,
refilling, repairment and maintenance.
