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Stars and the solar system
- 1. A PRESENTATION ON STARS AND THE SOLAR SYSTEM
- 2. TOPICS TO BE COVERED ▸ Stars ▸ Constellations ▸ Solar system ▸ Satellites ⭐ 🦀 🌎 🛰
- 3. STARS
- 4. STARS ▸ Stars are luminous bodies that are regularly seen as points of light in night sky ▸ Our sun is also a star ▸ The stars which we see are thousand of light years away from us ▸ A light year is distance travelled by light in one year
- 6. URSA MAJOR ▸ It is also called as great bear . ▸ The group of stars in Ursa Major is called BIG DIPPER or VRIHAT SAPTARSHI .
- 7. URSA MINOR ▸ It is also called lesser bear . ▸ The group of stars in Ursa Minor is called LITTLE DIPPER or LAGHU SAPTRISHI .
- 8. ORION ▸ It is most prominent and is easily identifiable. ▸ It looks like a hunter with bow .
- 9. ▸ This constellation is visible from northern hemisphere. ▸ It looks like “M” or “W” CASSIOPEIA
- 10. SOLAR SYSTEM
- 11. SUN % It is a medium sized star. % It is mainly composed of hydrogen. % It is so big that it could hold more than a million planets of the size of earth.
- 12. PLANETS
- 13. MERCURY • It is not always visible to us. • It is generally hidden in the sun’s glare. • It can be seen before sunrise in the month of September and October and after sunset in March and April.
- 14. VENUS • Brightest object in the night sky after the moon •It rotates from east to west. •Venus has no satellites.
- 15. EARTH •Earth takes 365.256 days to complete one rotation. •A thin layer of gases, called the atmosphere, envelops the earth. •99% of the earth's atmosphere is made up of nitrogen and oxygen.
- 16. MARS •It is visible to naked eye. •It looks like a bright orange red star. •Radius of mars is little more than half of earth.
- 17. JUPITER •Largest planet in the solar system. •Jupiter can be easily seen with the naked eye. •Jupiter has many moons.
- 18. SATURN • Second largest planet in the solar system. • It is also called the “Ringed Planet” • It has 25 satellite.
- 19. URANUS •Identified by the British astronomer William Hershel. •Uranus too has rings. •Uranus spins on its side.
- 20. NEPTUNE • It was identified by German astronomer Gottfried Galle. • It cannot be seen with naked eye. • It was two known satellites.
- 21. PLUTO • It is difficult to see Pluto from earth. • It was discovered by American Clyde Tombaugh.
- 23. ASTEROIDS •These are large pieces of rocks or metals. •Most Asteroids are found orbiting the sun between Mars and Jupiter.
- 24. COMETS •These are small chunks of ice and dust that revolve around the sun. •One of the best comet is Halley's Comet.
- 25. METEOROIDS • They are smaller than comets. • They are mainly chunks of rock. • They are called meteoroids when they are outside the atmosphere.
- 26. SATELLITES
- 27. METEORS •When meteoroids crosses the earths atmosphere, it burns up and heat is generated. •This makes a streak of light, which is called meteor or shooting star.
- 28. METEORITE •Sometimes, a meteoroid does not fully burn up in atmosphere and hits the earth's surface. •This is called a meteorite.
- 29. MOON •Moon is about one- fourth the size of the Earth. •Different shapes of moon are called phases of the moon.
- 30. Phases Of The Moon
- 31. At new moon, the moon is between the Earth and The Sun and we do not see any light.
- 32. After a few days, a small portion of the Moon is visible to us. This is called the crescent moon.
- 33. Then, the lit side of the moon becomes bigger every night and when half the moon can be seen, it is called first quarter.
- 34. The lit portion of the moon keeps increasing even further till it becomes a full moon.
- 36. SATELLITES • Man has sent many satellites into space. • The first artificial satellite was Sputnik -1