Category Science

In 2020, which astronaut completed the longest-ever single space-flight by a woman?

NASA astronaut Christina Koch has completed the longest-ever single spaceflight by a woman.

The Russian Soyuz spacecraft carrying Koch parachuted down to the grasslands of Kazakhstan at around 09:12 GMT.

She spent 328 days on the International Space Station (ISS), surpassing the previous record held by fellow American Peggy Whitson.

Her stay is just 12 days short of the all-time US record set by Scott Kelly, who was on the ISS from 2015-2016.

During her mission, Koch completed six spacewalks — including another two with Meir — and spent 42 hours and 15 minutes outside of the station.

Koch also devoted much of her time to a variety of experiments and investigations. The space station acts as an orbiting laboratory that can be used to test how different aspects of everyday human life on Earth react to the lack of gravity.

On the station, astronauts experience a plethora of science activities. Sometimes, they’re the test subject, contributing to studies about human health in space. Other times, they’re working with scientists on Earth to test their experiments.

 

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In 2007, who became the first woman to command the International Space Station?

On just her second spaceflight, Expedition 16, NASA astronaut Peggy Whitson became the first woman to command the International Space Station.

This year marks a milestone in spaceflight history, 20 years of continuous human presence aboard the International Space Station (ISS)

She became NASA’s first ISS Science Officer during her first flight (Expedition 5), the first female ISS commander with her second (Expedition 16), and the first two-time female commander of the ISS with her third and final stay on station (Expedition 50/51/52).

She has conducted 10 spacewalks totaling 60 hours and 21 minutes, holding the record for most spacewalks by a female astronaut. Whitson has also logged 665 days in space, the most for any American astronaut, placing her in the eighth spot on the all-time space endurance list.

From Oct. 2009 to July 2012, Whitson served as the Chief of the Astronaut Corps, the first woman and non-military astronaut to fill the role.

In 2018, Whitson retired from NASA.

 

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Which is the first American woman in space?

On June 18, 1983, NASA Astronaut Sally K. Ride became the first American woman in space, when she launched with her four crewmates aboard the Space Shuttle Challenger on mission STS-7.  Ride and five other women had been selected in 1978 for NASA Astronaut Group 8, the first American selection class to include females.  With the advent of the space shuttle, NASA expanded astronaut selection from only pilots to scientists and engineers, and women became eligible for selection.  NASA announced Ride and her classmates to the public on Jan. 16, 1978.

NASA announced Ride would be part of the STS-7 crew on April 30, 1982, serving as mission specialist and joining Commander Robert L. Crippen, mission specialist John M. Fabian, physician-astronaut Norman E. Thagard and pilot Frederick H. Hauck on the historic flight.

Over six days, the crew’s complex tasks included launching commercial communications satellites for Indonesia and Canada and deploying and retrieving a satellite using the shuttle’s robotic arm. Ride, who was 32 at the time, was the first woman to operate the shuttle’s mechanical arm. 

 

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Which is the second woman to travel into space was also the first woman to fly to space?

Svetlana Savitskaya was just the second woman to reach space. She was also a record-breaking jet pilot. Savitskaya was born in Moscow in 1948, and likewise started skydiving as a teenager. Her father, a high-ranking officer in the Soviet military, was allegedly unaware of her skydiving exploits. However, he soon supported her passion for flying jets, and Savitskaya quickly found herself competing in aerobatic competitions.

In 1970, while she was still in her early 20s, Savitskaya won the prestigious competition: the World Aerobatic Championship. That flying prowess helped her earn a spot as a cosmonaut, and she went on to earn her astronaut wings in 1982. That made her just the second woman to travel to space, following Tereshkova’s in 1963. Unlike Tereshkova, however, Savitskaya did get to fly a second time, making her the first woman to travel to space multiple times.

 

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In which the first signs of agriculture emerged?

The Fertile Crescent is a crescent-shaped region in the Middle East, spanning modern-day Iraq, Syria, Lebanon, Palestine, Israel, Jordan, and Egypt, together with the southeastern region of Turkey and the western fringes of Iran. Some authors also include Cyprus.

The region is one of the cradles of civilization because it is where settled farming first emerged as people started the process of clearance and modification of natural vegetation in order to grow newly domesticated plants as crops. Early human civilizations such as Sumer in Mesopotamia flourished as a result. Technological advances in the region include the development of agriculture and the use of irrigation, of writing, the wheel, and glass, most emerging first in Mesopotamia.

The main types of grain that were used for agriculture were wheat, barley, millet, and emmer. Rye and oats were not yet known for agricultural use. In Babylonia, Assyria, and the Hittite lands, barley was the main grain for human use: It was a widely used form of payment, and flat bread was made from barley. The smallest unit of weight was the equivalent of one grain (1/22 g). Beer and luxury foods were made from wheat and emmer.

Other agricultural products include sesame (derived from the Akkadian word šamaššammu), which was widely cultivated and used to make oil. Olive oil was produced in the mountains. Flax was used to make linen cloth. Peas were cultivated in Mesopotamia, while lentils were preferred in Palestine. Figs, pomegranate, apple, and pistachio groves were found throughout the Fertile Crescent. In villages and cities of southern Mesopotamia groves of date palms were common. The dates were eaten either fresh or dried, and palm wood was also used in crafts, but not in construction.

 

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In the study of the origins of agriculture, what does palynology mean?

Palynology is the study of pollen grains produced by seed plants (angiosperms and gymnosperms) and spores (pteridophytes, bryophytes, algae and fungi). Pollen and spores differ in their function, but both result from cell division involving a reduction by half of the chromosome content (meiosis) (Moore et al. 1991). Pollen grains house the male gametes, but spores are usually the resting or dispersal phase of the fern, algae, etc. Because of the larger size and the importance of pollen in pollination and to insects, pollen will be emphasized.

Pollen grains vary in shape from spherical to elliptic to triangular. Most pollen grains range from about 4 to 250 ìm. Pollen grains often have openings (pores) or furrows (colpus = singular, colpi = plural). A pollen grain with one colpus is called monocolpate. A pollen grain with three pores is triporate and one with three pores within three colpi is termed tricolporate. The outside layer of the pollen grain can be smooth (psilate), net-like (reticulate), or looks like a ball of string (striate). Some pollen grains even have spine like projections (echinate).

It is common knowledge that pollen is a major cause of allergies. However, pollen can be used to determine insect migration, insect food sources, honey types and in forensics, climatic changes, etc. There are several reasons pollen is used in these studies. First, pollen grains are distinctive, easily recognizable and identifiable to the family, genus and often species rank. Thus, very specific information can be obtained. Second, pollen is made up of sporopollenin that is durable and does not easily decay. Third, from the identification of the pollen, the geographical origin of the plant from which the pollen came can be determined.

 

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