spaceflight
19 questions tagged spaceflight — spanning every one of the seven Ws.
When was the first Space Shuttle launch?
The first Space Shuttle, Columbia, launched on 12 April 1981.
Where is Kennedy Space Center?
Kennedy Space Center is on Merritt Island on Florida’s Atlantic coast, next to Cape Canaveral.
Why are astronauts weightless in orbit?
They are not outside Earth’s gravity; they are in continuous free fall around Earth, which creates the feeling of weightlessness.
Why do spacecraft use gravity assists?
They fly past a planet to steal a tiny bit of its orbital momentum, which can speed them up or change their direction without extra fuel.
Why do spacecraft use gravity assists to travel through the Solar System?
A gravity assist lets a spacecraft steal a tiny bit of orbital energy from a moving planet. That can change speed and direction without burning much fuel.
Whose mission first photographed the far side of the Moon?
The Soviet spacecraft Luna 3 took the first photographs of the Moon’s far side in October 1959. It was the first time humans had seen that hidden hemisphere.
Whose mission first landed softly on the Moon?
The Soviet Union’s Luna 9 achieved the first soft landing on the Moon on 3 February 1966. It survived the landing and sent back surface images.
Whose mission first found water ice at the Moon’s south pole?
NASA’s LCROSS mission announced water ice in the Moon’s south polar region in 2009. The impact experiment detected water in the ejecta plume.
Whose mission first detected the solar wind close to the Sun?
NASA’s Parker Solar Probe, launched in 2018, made the first close in-situ measurements of the solar wind near the Sun. It has flown closer to the Sun than any previous spacecraft.
Whose mission first discovered the asteroid belt’s largest object was round enough to be a dwarf planet?
NASA’s Dawn mission showed Ceres in great detail after orbiting it in 2015. The spacecraft confirmed that Ceres is a spherical world with a complex surface and signs of water-rich history.
How do astronauts return to Earth safely from orbit?
They re-enter through the atmosphere, where friction and compression heat the spacecraft, and then deploy parachutes or use other landing systems. The capsule’s shape and heat shield are crucial.
Whose mission first demonstrated that a spacecraft could use gravity assist to change speed and direction around a planet?
That technique became famous through NASA's Mariner and Voyager missions, especially Mariner 10 and Voyager 1. Gravity assist was developed and first used in planetary flight planning by engineers such as Michael Minovitch and mission teams in the 1960s and 1970s.
Why does the International Space Station orbit Earth so fast?
It moves at about 7.66 kilometers per second so that its sideways speed balances Earth’s gravity and it keeps falling around the planet.
Why do astronauts feel weightless in orbit?
They are in continuous free fall around Earth, so both they and their spacecraft accelerate together.
What is a gravity assist?
A gravity assist is a spaceflight maneuver that uses a planet’s gravity to change a spacecraft’s speed and direction. It helps missions save fuel and reach distant targets.
When was the first liquid-fuel rocket launched successfully?
Robert H. Goddard launched the first successful liquid-fuel rocket in 1926.
How do scientists launch a satellite into a specific orbit?
They aim the rocket to reach the right speed, altitude, and direction, then use engine burns to fine-tune the orbit. The launch site and Earth’s rotation help determine the possible paths.
How do spacecraft use gravity assists to save fuel?
They fly past a planet and steal a tiny bit of its orbital momentum to change speed and direction.
How do action and reaction forces work in a rocket launch?
A rocket pushes exhaust gases backward, and the gases push the rocket forward with an equal and opposite force. This is Newton’s third law of motion.