China has landed its first rover on Mars

On May 14 China’s Tianwen-1 spacecraft, in orbit around the red planet, has dropped its lander and rover — named Zhurong ; other current American rovers (Curiosity and Perseverance).

LEARNING FROM HOME/ WITHOUT CLASSES/ BASICS

The order of the planets in the solar system, starting nearest the sun and working outward is the    following:  Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune 

The inner four planets closest to the sun — Mercury, Venus, Earth and Mars — are often called the “terrestrial planets” 

Our solar system consists of our star, the Sun, and everything bound to it by gravity — the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, dwarf planets such as Pluto, dozens of moons and millions of asteroids, comets and meteoroids. Beyond our own solar system, we have discovered thousands of planetary systems orbiting other stars in the Milky Way.closest star of solar system is Proxima Centauri.

It is composed of mainly Hydrogen and helium. Nuclear Fusion in the core of the Sun is source of all its energy.Photosphere is the glowing surface of the sun.its red coloured Chromosphere and beyond it is Corona(Visible during eclipses. Bright region on the surface of the earth are called Plages.

Mercury: It is the nearest to the Sun and also the smallest planet in our solar system.

Venus: It is called morning or an evening star, although it is not a star.Sometimes it is called as Earth’s twin.Venus has no moon or satellite of its own.

The Earth is the only planet in the solar system on which life is known to exist.Moon is the only natural satellite of Earth; also called blue planet. The axis of rotation of the Earth is 23.5 degrees relative to the orbital plane – the plane of Earth’s orbit around the sun. The tilt is responsible for the change of seasons on the Earth. The Earth takes 24 hours to complete a rotation. The Earth has only one moon.

Mars: It appears slightly reddish and, therefore, it is also called the red planet. Mars has two small natural satellites. Phobos and Deimos

Jupiter is the largest planet of the solar system. Ganymede is the biggest satellite others are Europa and  Callisto.

Saturn: It has an icy ring around it. It has max.no. of satellites. Largest moon is Titan.

Uranus also rotates from east to west (like Venus) also known as green planet.

The Neptune the eighth and most distant planet in our solar system;is dark, cold and has a presence of supersonic winds. Triton is its largest moon.

Asteroids and Comets

Asteroids and comets are considered remnants from the giant cloud of gas and dust that condensed to create the sun, planets, and moons some 4.5 billion years ago. Today, most asteroids orbit the sun in a tightly packed belt located between Mars and Jupiter. Comets tend to have more chemical compounds that vaporize when heated, such as water, and more elliptical (egg-shaped) orbits than asteroids do.

Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity. Nearly all large galaxies are thought to also contain supermassive black holes at their centers. In our own galaxy, the Milky Way, the sun is just one of about 100 to 400 billion stars that spin.

 

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