Category The Universe, Exploring the Universe, Solar System, The Moon, Space, Space Travel

WHAT IS JUPITER’S IO MOON?

Io or Jupiter I, is the innermost and third-largest of the four Galilean moons of the planet Jupiter. Slightly larger than Earth’s moon, Io is the fourth-largest moon in the Solar System, has the highest density of any moon, the strongest surface gravity of any moon, and the lowest amount of water (by atomic ratio) of any known astronomical object in the Solar System. It was discovered in 1610 by Galileo Galilei and was named after the mythological character Io, a priestess of Hera who became one of Zeus’s lovers.

With over 400 active volcanoes, Io is the most geologically active object in the Solar System.

This extreme geologic activity is the result of tidal heating from friction generated within Io’s interior as it is pulled between Jupiter and the other Galilean moons—Europa, Ganymede and Callisto. Several volcanoes produce plumes of sulfur and sulfur dioxide that climb as high as 500 km (300 mi) above the surface. Io’s surface is also dotted with more than 100 mountains that have been uplifted by extensive compression at the base of Io’s silicate crust. Some of these peaks are taller than Mount Everest, the highest point on Earth’s surface.  Unlike most moons in the outer Solar System, which are mostly composed of water ice, Io is primarily composed of silicate rock surrounding a molten iron or iron sulfide core. Most of Io’s surface is composed of extensive plains with a frosty coating of sulfur and sulfur dioxide.

Io’s volcanism is responsible for many of its unique features. Its volcanic plumes and lava flows produce large surface changes and paint the surface in various subtle shades of yellow, red, white, black, and green, largely due to allotropes and compounds of sulfur. Numerous extensive lava flows, several more than 500 km (300 mi) in length, also mark the surface. The materials produced by this volcanism make up Io’s thin, patchy atmosphere and Jupiter’s extensive magnetosphere. Io’s volcanic ejecta also produce a large plasma torus around Jupiter.

Io played a significant role in the development of astronomy in the 17th and 18th centuries; discovered in January 1610 by Galileo Galilei, along with the other Galilean satellites, this discovery furthered the adoption of the Copernican model of the Solar System, the development of Kepler’s laws of motion, and the first measurement of the speed of light. Viewed from Earth, Io remained just a point of light until the late 19th and early 20th centuries, when it became possible to resolve its large-scale surface features, such as the dark red polar and bright equatorial regions. In 1979, the two Voyager spacecraft revealed Io to be a geologically active world, with numerous volcanic features, large mountains, and a young surface with no obvious impact craters. The Galileo spacecraft performed several close flybys in the 1990s and early 2000s, obtaining data about Io’s interior structure and surface composition. These spacecraft also revealed the relationship between Io and Jupiter’s magnetosphere and the existence of a belt of high-energy radiation centered on Io’s orbit. Io receives about 3,600 rem (36 Sv) of ionizing radiation per day.

Further observations have been made by Cassini–Huygens in 2000, New Horizons in 2007, and Juno since 2017, as well as from Earth-based telescopes and the Hubble Space Telescope.

Credit : Wikipedia 

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How an astronaut’s spacesuit is made?

One of the weirdest features in space travel is the spacesuit worn by astronauts, with its huge spherical helmet, the tunic, the bulky gloves and boots and all the various gadgets and fittings.

The space-suit is a highly perfected machine in itself. It consists of no fewer than fifteen layers of special materials to protect the body of the astronaut. The space suit must provide oxygen for the astronaut to breathe and protect the astronaut from the vacuum and heat or cold of space. It must also be flexible enough to allow the astronaut to move freely. For travel in space, the astronaut wears an MMU (manned maneuvering unit), which contains small gas-powered thrusters. 

The space-suit must also contain food and water supplies, fitting to dispose of bodily wastes and surface to deflect heat and radiation. The helmet visor requires protective tilters to prevent the astronaut from viewing the Sun directly and risking severe dazzling and retinal burns. The suit also has to be fireproofed to the maximum possible extent.

The space-suit took years and millions of dollars to develop.

 

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Which mission by NASA will land the first woman and next man on the Moon by 2024?

With the Artemis program, NASA will land the first woman and next man on the Moon by 2024, using innovative technologies to explore more of the lunar surface than ever before. We will collaborate with our commercial and international partners and establish sustainable exploration by the end of the decade. 

Following a successful hot fire test, the core stage will be shipped to the agency’s Kennedy Space Center in Florida for integration with the spacecraft. NASA will launch an SLS and an Orion together on two flight tests around the Moon to check performance, life support, and communication capabilities. The first mission – known as Artemis I – is on track for 2021 without astronauts, and Artemis II will fly with crew in 2023.

In the Phase 1 plan, NASA notes additional details about conducting a new test during the Artemis II mission – a proximity operations demonstration. Shortly after Orion separates from the interim cryogenic propulsion stage, astronauts will manually pilot Orion as they approach and back away from the stage. This demonstration will assess Orion’s handling qualities and related hardware and software to provide performance data and operational experience that cannot be readily gained on the ground in preparation for rendezvous, proximity operations, and docking, as well as undocking operations in lunar orbit beginning on Artemis III.

In 2024, Artemis III will be humanity’s return to the surface of the Moon – landing the first astronauts on the lunar South Pole. After launching on SLS, astronauts will travel about 240,000 miles to lunar orbit aboard Orion, at which point they will directly board one of the new commercial human landing systems, or dock to the Gateway to inspect it and gather supplies before boarding the landing system for their expedition to the surface.

Wearing modern spacesuits that allow for greater flexibility and movement than those of their Apollo predecessors, astronauts will collect samples and conduct a range of science experiments over the course of nearly seven days. Using the lander, they will return to lunar orbit before ultimately heading home to Earth aboard Orion.

Work is progressing rapidly on the Gateway. NASA will integrate the first two components to launch – the power and propulsion element and the habitation and logistics outpost – in 2023. This foundation for the Gateway will be able to operate autonomously, conducting remote science experiments when astronauts are not aboard. NASA has selected the first two science instrument suites to conduct space weather investigations in lunar orbit before crew visits.

 

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How many women have flown in space so far?

As of December 2019, of the 565 total space travelers, 65 have been women. There have been one each from France, Italy, South Korea, and the United Kingdom; two each from Canada, China, and Japan; four from the Soviet Union/Russia; and 50 from the United States. The time between the first male and first female astronauts varied widely by country. The first astronauts originally from Britain, South Korea, and Iran were women, while there was a two-year gap in Russia from the first man in space on Vostok 1 to the first woman in space on Vostok 6. The time between the first American man and first American woman in space was 22 years between Freedom 7 and STS-7, respectively. For China, this interval was almost eight and a half years between the Shenzhou 5 and Shenzhou 9 space missions, and for Italy, there was approximately twelve years between the STS-46 and Expedition 42 spaceflights.

A span of 19 years separated the first and second women in space. They were cosmonauts on the Vostok 6 and Soyuz T-7 missions. Though the Soviet Union sent the first two women into space, only four of the women in space have been Russian or Soviet citizens. However, British, French, Italian, dual-citizen Iranian-American and South Korean women have all flown as part of the Soviet and Russian space programs. Similarly, women from Canada, Japan, and America have all flown under the US space program. A span of one year separated the first and second American women in space, as well as the first and second Chinese women in space, taking place on consecutive missions, Shenzhou 9 and Shenzhou 10.

 

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In 2006, which astronaut with Indian ancestry established a world record for women with four spacewalks?

Indian-American astronaut Sunita Williams, who holds the record of the longest space flight (195 days) for a woman, arrived at her new home amid stars with an international cast of crew for another four-month stay.

In 1993 she became a naval test pilot, and she later became a test pilot instructor, flying more than 30 different aircraft and logging more than 2,770 flight hours. When selected for the astronaut program, she was stationed aboard the USS Saipan.

Williams completed an M.S. in engineering management from the Florida Institute of Technology in Melbourne in 1995, and she entered astronaut training in 1998. She traveled to Moscow, where she received training in robotics and other ISS operational technologies while working with the Russian Federal Space Agency (Roskosmos) and with crews preparing for expeditions to the ISS.

 

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Which is the first woman of Indian descent to go into space?

Born on March 17, 1962, in Karnal, Kalpana Chawla was the first Indian-origin woman to go into space. Chawla joined NASA in 1988 and first flew aboard Space Shuttle Columbia in 1997. The astronaut died on her second mission aboard Columbia in 2003. Sunita Williams, born in the US, became the second Indian-origin woman to travel into space in 2006.

Born in Karnal, Chawla received a degree in aeronautical engineering from Punjab Engineering College before moving to the United States for her masters and PhD. In 1994, she was selected as an astronaut candidate at NASA.

Chawla first travelled to space aboard the ill-fated space shuttle Columbia flight STS-87. The shuttle made 252 orbits around the Earth in a little over two weeks, before the tragic accident that took place in February while it was returning to Earth.

Chawla moved to the United States to pursue her graduate education; in 1984 she received a Master’s degree in aerospace engineering from the University of Texas, and a Ph.D. in aerospace engineering from the University of Colorado in 1988. She held commercial pilot’s licenses for single- and multi-engine aeroplanes, seaplanes and gliders, and was also a certified flight instructor.

After becoming a naturalised US citizen in April 1991, Chawla applied for the NASA astronauts corps. She was selected in December 1994 and reported to the Johnson Space Center in Houston in 1995 as an astronaut candidate in Group 15. In November 1996, Chawla was assigned as a mission specialist on STS-87 aboard the Space Shuttle Columbia, becoming the first woman of Indian descent to fly in space.

 

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