scienceknowledge

  Jupiter- The Biggest planet of Solar system     Jupiter has a long history of surprising scientists – all the way back to 1610 when Galileo Galilei found the first moons beyond Earth. That discovery changed the way we see the universe.  Fifth in line from the Sun, Jupiter is, by far, the largest planet in the solar system – more than twice as massive as all the other planets combined. One spacecraft – NASA's Juno orbiter – is currently exploring this giant world.  Jupiter’s four largest moons (the Galilean Satellites) are Io, Europa, Ganymede and Callisto. Jupiter have 53 confirmed | 26 provisional ( 79 total) Jupiter is the largest planet in our solar system at nearly 11 times the size of Earth and 317 times its mass. Jupiter, being the biggest planet, gets its name from the king of the ancient Roman gods. Despite its size, Jupiter has the shortest day of any other planet; it only takes about 10 hours for a complete rotation. A lot like the Sun, Jupiter...

  Mars- Our Future home Mars is the fourth terrestrial planet planet from the Sun – a dusty, cold, desert world with a very thin atmosphere. Mars is also a dynamic planet with seasons, polar ice caps, canyons, extinct volcanoes, and evidence that it was even more active in the past. Mars is one of the most explored bodies in our solar system, and it's the only planet where we've sent rovers to roam the alien landscape.NASA currently has two rovers ( Curiosity and Perseverance ), one lander ( InSight ), and one helicopter ( Ingenuity ) exploring the surface of Mars. In May 2021, China became the second nation to ever land successfully on Mars when its Zhurong Mars rover touched down.  Exploration No planet beyond Earth has been studied as intensely as Mars. Recorded observations of Mars date as far back as the era of ancient Egypt over 4,000 years ago, when they charted the planet's movements in the sky. Today, NASA has a fleet of robotic spacecraft studying Mars f...

Earth -our Home Earth Our home planet is the third planet from the Sun, and the only place we know of so far that’s inhabited by living things. Our Earth is 5th biggest planet in solar system. it is the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal. The name Earth is at least 1,000 years old Size The Earth have radius of 6371 kilometers  (approx 6400) Earth is largest terrestrial planet Earth is exactly one astronomical unit away from the Sun because one astronomical unit (abbreviated as AU), is the distance from the Sun to Earth.  Orbit and Rotation As Earth orbits the Sun, it completes one rotation every 23.9 hours. It takes 365.25 days to complete one trip around the Sun. That extra quarter of a day presents a challenge to our calendar system, which counts one year as 365 days. Earth's axis of rotation is til...

  Mercury          Mercury is the closest to the sun and first, no moon, terrestrial planet and smallest  planet of solar system. it revolve the sun faster than all the other planets, which is why Romans named it after their swift-footed messenger god. The Sumerians also knew of Mercury since at least 5,000 years ago. It was often associated with Nabu, the god of writing . Mercury was also given separate names for its appearance as both a morning star and as an evening star. Greek astronomers knew, however, that the two names referred to the same body, and Heraclitus, around 500 B.C., correctly thought that both Mercury and Venus orbited the sun, not Earth. NASA's MESSENGER spacecraft orbited Mercury for more than four years. this spacecraft is launch by Delta 7925H And it 1,107.9 kilograms  Among its accomplishments, the mission determined Mercury’s surface composition, revealed its geological history, discovered details about it...

Universe and Units use by astronauts What is Universe? The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. Before the birth of the Universe, time, space and matter did not exist.   The Universe have uncountable stars and millions of galaxies The space between the stars and galaxies is largely empty. However, even places far from stars and planets contain scattered particles of dust or a few hydrogen atoms per cubic centimeter. Space is also filled with radiation (e.g. light and heat), magnetic fields and high energy particles .  The universe is very huge, we can imagine by this if we take modern fighter jet , we take million of years to reach only nearest star of our sun or by traveling with the speed of light(which is 300000km per sec)it will take time 100000 light years to cross only milky way galaxy  Units Used In astronomy Astronomical Unit- Distanc...

  Space What is space? Space is area where is possibility of atmosphere is very less. It is mainly a vacuum. in space no one cannot hear a sound waves because sound need medium to travel but space is vacuum where no air is present outer space begins about 100 km above the Earth where the shell of air around a planet, disappears as result there is no air  scattering of the sun light  which appears the sky blue not happen, and the blue sky becomes dark sky. Space usually regarded as completely vacuum but it is not true there is vast gaps between stars and planet are filled with huge amount of gas, dark matter(not discovered having possibility discover)  and dust Even the emptiest parts of space contain at least a few hundred atoms or molecules per cubic metre.    Space also consist radiation like x rays, gamma rays, infrared rays, cosmic rays and uv rays which is harmful for astronauts much of radiation like infrared rays and uv rays come our solar system sun...