science Flashcards
(108 cards)
pratyush
India’s fastest supercomputer at Pune with a capacity of 4 petaflops
Mihir
a high-performance computer system at Noida with a capacity of 2.8 petaflops.
It is India’s first multi-petaflop supercomputer and is the fourth fastest supercomputer in the world which
is dedicated to weather and climate research after Japan, U.S.A, and the United Kingdom
Other top five supercomputers of India are
SahasraT (Cray XC40), Aaditya (IBM/Lenovo system), TIFR Colour Boson (Cray XC-30), IIT Delhi HPC and Param Yuva 2
Cartosat-2 series
It an earth observation satellite whose high-resolution scene-specific spot images will be useful
for cartographic applications, urban and rural applications, coastal land use and regulation, road network monitoring, water distribution, creation of land use maps and change detection to bring out geographical Land Information Systems and Geographical Information System applications.
Parker Solar Probe by NASA
It will study how energy and heat move through
the solar corona and to explore what accelerates
the solar wind as well as solar energetic particles.
NASA’s Star-Planet Activity Research CubeSat (SPARCS)
SPARCS is a space telescope to study the
habitability and high-energy environment around
M-dwarf stars. The telescope will study the Ultra-Violet light emitted by dwarf stars.
M-dwarf stars
Dwarf stars are generally cooler and they may be
surrounded by many habitable zones.
NASA’s Global-scale Observations of the
Limb and Disk (GOLD) and Ionospheric Connection
Explorer (ICON) mission:
ICON will be in low-Earth orbit at 560 km above
Earth and GOLD will be at 35398 km above the earth surface in a geostationary orbit. They will study the Ionosphere region or the boundary area between Earth and space where electrically-charged electrons and ions by the Sun’s radiation are present. The missions will help in understanding how the upper atmosphere changes in response to hurricanes and geomagnetic
storms.
Chandrasekhar limit
maximum mass of a stable white dwarf star and a mass greater than the limit will turn the star into a neutron star or black hole at the end of its life.
Dwarf Stars
A dwarf star form at the end of star’s evolutionary phase. It has a mass of up to about 20 sols (Our Sun), and luminosity of up to about 20,000 sols.
NASA’s Transiting Exoplanet Survey Satellite (TESS)
study exoplanets in orbit around the brightest
stars in the sky
NASA’s InSight Mars lander
will study the interior of Mars and listen for Marsquakes.
NASA’s OSIRIS-Rex
launched earlier in 2016 is scheduled to arrive at the near-Earth asteroid Bennu in August 2018.
ICESat-2 and GRACE satellites
to observe Earth’s ice sheets, sea level, and underground water reserves.
Blue Moon
When two full moons appear in the same calendar month, the second is termed a “blue moon”.
Super Moon
when the full moon is at the closest point of its orbit to the Earth, which is also called the perigee. The moon
appears 30% brighter and 14% bigger than the apogee full moon
Blood Moon
The moon turns into red color during the height of the eclipse as some light does reach it even though the moon is in the shadow of the Earth. Fine particles in the atmosphere scatter (Rayleigh scattering) the blue component of solar spectrum, & what reaches us is the longer wavelength red light.
Lunar Eclipse
A lunar eclipse happens whenever the moon passes through Earth’s shadow, also known as its umbra. A lunar eclipse can occur only on the night of a full moon.
Free Space Optical Communication (FSOC)
X Development LLC, a subsidiary of Alphabet will supply and deploy 2000 cutting-edge Free Space Optical Communication (FSOC) links for Andhra Pradesh (AP) fiber-grid. It is an optical communication technology in which data is transmitted by propagation of light in free space allowing optical connectivity. Working of FSO is similar to OFC (optical fiber cable) networks but the only difference is that the optical beams are sent through free air or vacuum instead of glass fiber.
• It is a Line of Sight (LOS) technology. It consists of an optical transceiver at both ends to provide full duplex
(bidirectional) capability.
•It is capable of sending up to 1.25 Gbps of data, voice, and video communications simultaneously through
the air. It has low error rate.
NASA’s SOFIA (Stratospheric Observatory for Infrared Astronomy)
It is an aircraft (Boeing 747SP jetliner) modified to carry a 100-inch diameter telescope. It is a joint project of NASA and the German Aerospace Centre, DLR.
• It is the world’s largest airborne astronomical observatory and is in fourth year of operation now.
• Its 2.5 diameter telescope allows astronomers to access the visible, infrared and sub-millimeter spectrum. It has the ability to produce a higher resolution image, three times higher in quality than those captured by
other observatories.
It is going to study observations of celestial magnetic fields, star-forming regions, comets and Saturn’s giant moon Titan.
Through observations from SOFIA scientists also aim to:
• study comet 46P/Writanen as it passes close to the Earth, to search for clues in the comet’s dust that may
understand the evolution of the early solar system.
• understand how active black holes contribute to most luminous, distant galaxies.
• understand how magnetic fields affect the rate at which interstellar clouds condense to form new stars.
• understand how methane levels change with seasons on Mars.
Excitons
- When an electron which is seated at the edge of the crowded electron valence band gets excited and jumps over the energy gap into an empty conduction band, it leaves behind a hole in the valence band.
- The hole in the valence band acts as a positively charged particle and attracts the escaped electron.
- When the escaped electron with negative charge pairs with the hole, a composite bosonic particle – exciton is formed.
3200 Phaethon
It is an Apollo Asteroid and has characteristics close to a comet.
• Sometimes the orbits of an asteroid intersect with the orbit of Mars and Earth. The earth orbiting asteroids
are called Apollo Asteroids.
Geminid meteor shower
It fell on Earth on Dec 12. Usually, meteor shower happens due to the debris left behind by a Comet. However, it can happen due to an asteroid as well such as in the case of Geminid Shower.
• Geminid Meteor shower is the dust particle of constellation of Gemini. Earth passes through the path of its parent asteroid 3200 Phaethon every year.
Intergovernmental Oceanographic Commission
- It was established in 1960.
- It is the only competent organization for marine science within the UN system.
- The purpose of the Commission is to promote international cooperation and to coordinate programmes in research, services, and capacity-building, in order to learn more about the nature and resources of the ocean and coastal areas.