1)_______ nakshatra or orion has very bright stars
2) a group of stars occupying a small portion of the celestial is called______
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Answers
Explanation:
There are four major branches of science; each branch is categorized in different type of subjects that covers different areas of studies such us chemistry, physics, math, astronomy etc. The four major branches of science are, Mathematics and logic, biological science, physical science and social science.
Fig. 17.8 The solar system (not to scale)
Period of Revolution: The time taken by a planet to complete one revolution around the sun is called its period of revolution.
Satellite: The body revolving around a planet is called a satellite. Moon is the natural satellite of the earth.
Different Planets: The solar system consists of eight planets revolving around the sun in their orbits as shown in Fig. 17.8. The arrangement of planets in Fig. 17.8 is with respect to the position of the sun, i.e. in order of distance from the sun.
Mercury (Budh): It is the smallest planet and nearest to the sun. Mercury has no satellite of its own.
Venus (Shukra): It is nearest to the earth and is the brightest planet in the night sky. Venus has no moon or satellite of its own. It rotates from east to west while the earth rotates from west to east.
Comet: A comet appears as a bright head with a long tail. They revolve around the sun in highly elliptical orbits. The tail of a comet is always directed away from the sun.
Meteors and Meteorites: Sometimes we see bright streaks of light in the sky. These are commonly known as shooting stars, although they are not stars. Actually, these are small objects which glow due to friction when they enter the earth's atmosphere. These are called meteors. Meteors glow and evaporate quickly before reaching the Earth's surface. The bodies that reach the earth are called as meteorites.
Artificial Satellites: They are man-made and launched from the earth. They revolve around the earth much closer than the moon. Aryabhatta was the first Indian satellite. Artificial satellites are used for weather forecasting, education, long distance communication and remote sensing.
• The Earth (Prithvi): It is the fifth largest planet and third in order of distance from the sun. It is the only planet of the solar system known to support life, because it has atmosphere, water, suitable temperature and a blanket of ozone. The earth has one natural satellite called the moon. The axis of rotation of the earth is tilted to the plane of its is. The tilt is responsible for the change of seasons on the earth.
• Mars (Mangal): It is the first outside the orbit of the earth. It is also known as red planet. It has two satellites.
• Jupiter (Brihaspati): It is the largest planet of the solar system. It has a large number of satellites (moons).
• Saturn (Shani): It appears yellowish in colour. It has beautiful rings. Saturn has a large number of satellites. It is least dense among all the planets.
• Uranus (Indra): Like Venus, Uranus also rotates from east to west. It has highly tilted rotational axis. So in its orbital motion Uranus appears to roll on its side.
• Neptune (Varun): It is the outermost planet of the solar system. It has two moons.
Asteroids: A large number of small objects that revolve around the sun between Mars and Jupiter are called asteroids.