Category Physics

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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Do all the planets and their moons have active volcanoes?

For many years, scientists believed that Jupiter’s moon lo was geologically dead. This means it didn’t have things such as earthquakes, newly forming mountains or volcanoes. However, it turns out the scientists were wrong about lo. In 1979, when NASA’s Voyager 1 spacecraft took close up pictures of lo, the pictures showed a massive plume erupting from lo’s surface into space. That’s when they realise that lo did not just have volcanoes, it had active volcanoes. And, lo was no longer considered geologically dead. When these pictures were taken it was the first time an erupting volcano was found anywhere other than Earth. So that leaves us wondering, do all the planets and their moons have active volcanoes? Let’s take a look

Mercury: The planet once had active volcanoes, but not anymore. Scientists believe violent volcanic eruptions that shaped Mercury’s surface, likely ended about 3.5 billion years ago.

Venus: Venus, on the other hand is covered with volcanoes. The hottest planet in our solar system has over 1,000 volcanoes, including some that might still be active, according to what scientists think.

Mars: Mars is home to Olympus Mons, the solar largest volcano in our system. It is also the mountain in our solar largest led our solar system Mars is filled with tall volcanic mountains, and while scientists haven’t seen an eruption on Mars, they think there could be some in the future.

Jupiter: Scientists have found volcanoes and observed volcanic activity only on lo, Jupiter’s moon. Eruptions from lo’s volcanoes are so massive that it can been seen by a spacecraft that is pretty far from lo.

Saturn: Saturn’s moon Enceladus has cryovolcanoes. These volcanoes are similar to regular volcanoes, except they spew water and other gases like geysers.

Uranus: Since it is a gas planet, it does not have any volcanoes.

Neptune: While Neptune doesn’t have volcanoes as it is a gas planet, its frozen moon, Triton, has cryovolcanoes that are active.

 

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What makes it snow?

Take a close look at some snowflakes. You can see that they aren’t drops, like rain; or lumps, like hail; or tiny beads, like sleet. They look more like little feathers.

Snow forms when water vapour in clouds freezes. It forms at the top of storm clouds where the air is colder. The frozen water drops grow as more water vapour freezes onto them. They turn into tiny, clear pieces of ice called snow crystals. A snowflake is actually a bunch of snow crystals.

When you look at a snowflake through a magnifying glass, you see a beautiful, lacy shape. Even when they may seem the same, no two snow crystals are exactly alike. Some are flat. Others are shaped like long needles. Most look like pieces of lace. Yet, in one way they are almost all the same. Almost all snow crystals have six sides.

Snow can form high in the sky even in summer. But when snow falls in summer, it melts and becomes rain as soon as it reaches warm air lower down.

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What causes lightning and thunder?

Lightning and Thunder

A flash of light zigs and zags across the sky. Another flash zaps its way to the ground. A loud crack, boom, or rumble sounds soon after. The flash is lightning. The sound is thunder.

The flash we see when snakes through the sky lightning is really a huge electric spark. During a thunderstorm, each tiny drop of water in a cloud becomes electrically charged making the whole cloud charged. When this electrical charge becomes strong enough, it forms a huge electrical spark – lightning.

Lightning can travel in many ways. Sometimes a charge flashes from one place to another within a cloud. Other times, electricity rushes between two clouds with electrical charges. Also, lightning can strike the ground.

A flash of lightning heats up the air around it. The heated air spreads or rushes out in all directions. As it swells, it slams into cooler air, making it shake. This is what causes the sound of thunder.

Picture Credit : Google