Category Science

According to International Astronomical Union (IAU), which began meeting in August of 2006, the term Plutoid now applies to Pluto, as well as any other small stellar body that exist beyond the range of Neptune.

Pluto was to these stellar objects what Ceres was to large objects in the asteroid belt – that is to say, comparable in size. Astronomers proposed several names for these objects, but matters did not come to a head until Eris was discovered. This dwarf planet was actually larger than Pluto, 2500 km in diameter, making it twenty-seven percent larger than Pluto.

In the end, the IAU could only resolve this matter by removing Pluto from the list of planets and devising a new category for dwarf planets that could no longer be considered true planets. Plutoid was the result, and now applies to the trans-Neptunian objects of Pluto, Haumea, Makemake, and Eris.

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Jupiter is the fifth planet from our Sun and is, by far, the largest planet in the solar system – more than twice as massive as all the other planets combined. Jupiter’s stripes and swirls are actually cold, windy clouds of ammonia and water, floating in an atmosphere of hydrogen and helium. Jupiter’s iconic Great Red Spot is a giant storm bigger than Earth that has raged for hundreds of years.

The composition of Jupiter is similar to that of the Sun—mostly hydrogen and helium. Deep in the atmosphere, pressure and temperature increase, compressing the hydrogen gas into a liquid. This gives Jupiter the largest ocean in the solar system—an ocean made of hydrogen instead of water. Scientists think that, at depths perhaps halfway to the planet’s center, the pressure becomes so great that electrons are squeezed off the hydrogen atoms, making the liquid electrically conducting like metal. Jupiter’s fast rotation is thought to drive electrical currents in this region, generating the planet’s powerful magnetic field. It is still unclear if, deeper down, Jupiter has a central core of solid material or if it may be a thick, super-hot and dense soup. It could be up to 90,032 degrees Fahrenheit (50,000 degrees Celsius) down there, made mostly of iron and silicate minerals (similar to quartz).

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Valentina Vladimirovna Tereshkova born 6 March 1937) is a member of the Russian State Duma, engineer, and former cosmonaut. She is the first and youngest woman to have flown in space with a solo mission on the Vostok 6 on 16 June 1963. She orbited the Earth 48 times, spent almost three days in space, and to date remains the only woman to have been on a solo space mission.

Valentina Tereshkova was born on 6 March in 1937 in the Bolshoye Maslennikovo, a village on the Volga River 270 kilometres (170 mi) northeast of Moscow and part of the Yaroslavl Oblast in central Russia. Her parents had migrated from Belarus. Her father, Vladimir Tereshkov, was a former tractor driver and a sergeant in command of a tank in the Soviet Army. He died in the Finnish Winter War during World War II when Tereshkova was two years old. He and her mother Elena Fyodorovna Tereshkova had three children. After her father’s death, her mother moved the family to Yaroslavl, seeking better employment opportunity, and became employed at the Krasny Perekop cotton mill.

After Yuri Gagarin became the first man in space in 1961, Tereshkova volunteered for the Soviet space program. Although she did not have any experience as a pilot, she was accepted into the program because of her 126 parachute jumps. At the time, cosmonauts had to parachute from their capsules seconds before they hit the ground on returning to Earth.

Along with four other women, Tereshkova received 18 months of training, which included tests to determine how she would react to long periods of time being alone, to extreme gravity conditions and to zero-gravity conditions. Of the five women, only Tereshkova went into space.

Tereshkova was chosen to pilot Vostok 6. It was to be a dual mission. Cosmonaut Valeriy Bykovsky launched on Vostok 5 on June 14, 1963.

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An American commercial cargo spacecraft bound for the International Space Station has been named after fallen NASA astronaut Kalpana Chawla, the first India-born woman to enter space, for her key contributions to human spaceflight. Northrop Grumman, an American global aerospace and defence technology company, announced that its next Cygnus capsule will be named the “S.S. Kalpana Chawla”, in memory of the mission specialist who died with her six crewmates aboard the space shuttle Columbia in 2003.
In 2000, Chawla was selected for her second voyage into space, serving again as a mission specialist on STS-107. The mission was delayed several times, and finally launched in 2003. Over the course of the 16-day flight, the crew completed more than 80 experiments.

On the morning of Feb. 1, 2003, the space shuttle returned to Earth, intending to land at Kennedy Space Center. At launch, a briefcase-sized piece of insulation had broken off and damaged the thermal protection system of the shuttle’s wing, the shield that protects it from heat during re-entry. As the shuttle passed through the atmosphere, hot gas streaming into the wing caused it to break up. The unstable craft rolled and bucked, pitching the astronauts about. Less than a minute passed before the ship depressurized, killing the crew. The shuttle broke up over Texas and Louisiana before plunging into the ground. The accident was the second major disaster for the space shuttle program, following the 1986 explosion of the shuttle Challenger.

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Apollo was the NASA program that resulted in American astronauts’ making a total of 11 spaceflights and walking on the moon.

The first four flights tested the equipment used in the Apollo Program. Six of the other seven flights landed on the moon. The first Apollo flight happened in 1968. The first moon landing took place in 1969. The last moon landing was in 1972.

A total of 12 astronauts walked on the moon. The astronauts conducted scientific research there. They studied the lunar surface. They collected moon rocks to bring back to Earth.

NASA designed the Apollo Command Module for this program. It was a capsule with room for three astronauts. The astronauts rode in the Command Module on the way to the moon and back. It was larger than the spacecraft used in the Mercury and Gemini programs. The astronauts had room to move around inside the spacecraft. The crew area had about as much room as a car.

Another spacecraft, the Lunar Module, was used for landing on the moon. This spacecraft carried astronauts from orbit around the moon to the moon’s surface, then back into orbit. It could carry two astronauts.

Two types of rockets were used for the Apollo program. The first flights used the smaller Saturn I (1) B rocket. It was about as tall as a 22-story building. This rocket had two stages. That means it was made of two parts. When the first part ran out of fuel, it dropped away from the other and burned up in Earth’s atmosphere. The second part continued flying. The Saturn IB rocket was used to test the new Apollo capsule in Earth orbit.

The other flights used the more powerful Saturn V (5) rocket. This three-stage rocket sent the Apollo spacecraft to the moon. It was about as tall as a 36-story building.

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Hayabusa was a Japanese spacecraft that brought back a sample of asteroid material to Earth in 2010, after a mission riddled with technical glitches. The spacecraft touched down on a small near-Earth asteroid called 25143 Itokawa and safely brought back minute rocky particles for analysis.

The success of the mission inspired a successor spacecraft, called Hayabusa 2. This spacecraft is on its way to asteroid 162173 Ryugu and is expected to arrive in July 2018. Asteroid samples will be returned to Earth in December 2020.

In November 2010, JAXA said it had collected 1,500 grains that “were identified as rocky particles”; most of them were thought to come from “extraterrestrial origin” (meaning, the asteroid). JAXA had known beforehand that the particles of material were there, but it took several months of analysis to confirm they were not contamination from Earth or from Hayabusa’s voyage.

In the initial results, JAXA announced it found minerals such as olivine and pyroxene, which are common on Earth and have been found on the moon and Mars. The particles were tiny, just one-tenth the width of a human hair (10 micrometers in size). Several articles on Hayabusa’s dust collection appeared in the Aug. 26, 2011, issue of Science; among the findings was confirmation that the dust on 25143 Itokawa was identical to material on an LL chondrite type of meteorite. This finding confirmed showed link between meteorites and asteroids.

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