World Largest space telescope

Largest space telescope The $2.1-billion (£1.4-billion) NASA Edwin P. Hubble Space Telescope weighs 11 tonnes (24,250 lb) and is 13.1 m (43 ft) in overall length, with a 240-cm (94.8-in) reflector. It was was launched into space, at an altitude of 613 km (381 miles), by the US space shuttle Discovery on 24 April 1990.  

The Hubble Space Telescope (HST) is a space telescope that was carried into orbit by a space shuttle in 1990. Although not the first space telescope, Hubble is one of the largest and most versatile, and is well-known as both a vital research tool and a public relations boon for astronomy. The HST was built by the United States space agency NASA, with contributions from the European Space Agency, and is operated by the Space Telescope Science Institute. It is named after the astronomer Edwin Hubble. The HST is one of NASA's Great Observatories, along with the Compton Gamma Ray Observatory, the Chandra X-ray Observatory, and theSpitzer Space Telescope.

Organization	NASA / ESA / STScI
Launch date	April 24, 1990, 8:33:51 am EDT
Launch vehicle	Space Shuttle Discovery (STS-31)
Mission length	20 years, 8 months, and 4 days elapsed
Deorbited	due ~2013–2021
Mass	11,110 kg (24,500 lb)
Type of orbit	Near-circular low Earth orbit
Orbit height	559 km (347 mi)
Orbit period	96–97 minutes (14-15 periods per day)
Orbit velocity	7,500 m/s (25,000 ft/s)
Acceleration due to gravity	8.169 m/s2 (26.80 ft/s2)
Location	Low Earth orbit
Telescope style	Ritchey-Chrétien reflector
Wavelength	Optical, ultraviolet, near-infrared
Diameter	2.4 m (7 ft 10 in)
Collecting area	4.5 m2 (48 sq ft)
Focal length	57.6 m (189 ft)
Instruments
NICMOS	infrared camera/spectrometer
ACS	optical survey camera (partially failed)
WFC3	wide field optical camera
COS	ultraviolet spectrograph
STIS	optical spectrometer/camera
FGS	three fine guidance sensors
Website	hubble.nasa.gov hubblesite.org www.spacetelescope.org

World Largest Submarine

The worlds largest submarines are the Russian 941 Akula (designated 'Typhoon' by NATO) class. The launch of the first at the secret covered shipyard at Severodvinsk in the White Sea was announced by NATO on 23 Sep 1980. The vessels are believed to have a dived displacement of 26,500 tonnes (58.422 million lb), to measure 171.5 m (562 ft 7 in) overall and to be armed with 20 multiple warhead SS-N-20 missiles with a range of 8300 km (4500 nautical miles). It is thought less than five remain in service.  

Project 971 Щука-Б ( NATO reporting name"Akula"), is a nuclear-powered attack submarine (SSN) first deployed by the Soviet Navy in 1986. There are three sub-classes or flights of Shchuka, consisting of the original seven "Akula I" submarines which were built between 1982 and 1986, five "Improved Akula" submarines built between 1986 and 1991, and two "Akula II" submarines built from 1991. The distinction between the Improved Akula and the Akula II class is debated by authoritative sources.The Russians call all of the submarines Schuka-B, regardless of modifications.

Name:	Akula
Operators:	Soviet Navy  Russian Navy
Preceded by:	Operational precedessor: Victor class By sequence of construction: Sierra class
Succeeded by:	Graney class, Severodvinsk Class (in development)
In service:	1986
Planned:	20
Completed:	15
Cancelled:	5
Active:	9 (8 In Russia, 1 training for India)
Retired:	2
Preserved:	3

Type:	nuclear-powered attack submarine
Displacement:	5,700-8,140 tons surfaced 7,900-9,100 tons submerged 7,900-12,770 tons submerged (Akula-II)
Length:	108.0 - 111.7 m (sources vary)
Beam:	13.6 m
Draught:	9.7 m
Propulsion:	one 190 MW OK-650B/OK-650Mpressurized water nuclear reactor 1 OK-7 steam turbine 43,000 hp(32 MW) 2 OK-2 Turbogenerators producing 2,000 kW 1 seven-bladed propeller 2 retractable electric propulsors for low-speed maneuvering at 3 knots (6 km/h)
Speed:	11,6 knots (37 km/h) surfaced 33 knots (65 km/h) submerged
Endurance:	100 days
Test depth:	480 m operational depth 600 m test depth
Complement:	73
Crew:	73
Sensors and processing systems:	MGK-540 active/passive suite Flank arrays Pelamida towed array sonar MG-70 mine detection sonar
Electronic warfare and decoys:	Bukhta ESM/ECM *MG-74 Korund noise simulationdecoys (fired from external tubes) MT-70 Sonar intercept receiver Nikhrom-M IFF
Armament:	4x533mm torpedo tubes (plus 6 external 533mm tubes on Improved Akulas and Akula II's; 28 torpedoes) 4x650mm torpedo tubes (12 torpedoes) 1-3x SA-N-10 Igla-M Surface-to-air missile launcher fired from sail (surface use only)
Notes:	Chiblis Surface Search radar Medvyedista-945 Navigation system Molniya-M Satellite communications MGK-80 Underwater communications Tsunami, Kiparis, Anis, Sintez and Kora Communications antennas Paravan Towed VLF Antenna Vspletsk Combat direction system