6 Space Physics

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Across
  1. 3. Is a region in the space, in which the effect of gravity is so strong, that it lets nothing escape out f it, not even light.The region appears to be black and circular.[ There are approximately 100 billion super massive black holes]
  2. 4. Is the distance traveled in (the vacuum of) space by light in one year.
  3. 8. Is a single term that includes eight planets and their moons in orbit round the sun. Also included in the solar system are the smaller bodies such as the comets., asteroids, and the meteoroids.
  4. 11. These are aging giant stars with a minimum of 15 solar masses. [solar mass refers to the mass of the sun, when used as a unit of mass. One solar mass is equal to 1.989 x 1030 kg ]
  5. 13. In every star, there is the gas pressure that exerts an outward force from the centre and at the same time , there is gravity that is pulling the atoms of Hydrogen and Helium inwards. When the outward pushing force balances the gravitational force, we call the star as a stable tar.Example of a stable star is the Sun.
  6. 16. Is the time taken by one object to completely orbit around the other.
  7. 18. Is a term that indicates the amount of gravitational force that is exerted per unit mass at a particular point.It has a symbol "g"
  8. 20. Is a powerful and luminous stellar explosion, that happens when a star has reached the end of its life.Example: Kepler's Supernova
  9. 21. These are massive , luminous stars with a very low surface temperature and a high volume , with a reddish-orange hue, in their final stage of stellar evolution and that have exhausted their supply of Hydrogen in their core.Examples: Aldebaran (Alpha Tauri) and Mira (Omicron Ceti).
  10. 22. It encompasses billions of stars along with their solar systems,gas and dust held by their gravity. There are more than a hundred billion galaxies in the universe.
  11. 23. Is the ratio of the speed at which the galaxy is moving away from the Earth to its distance from the Earth
  12. 24. It refers to the data that gives us information on the different planets based on researches and explorations
  13. 25. Is the leftover of the cosmic radiation after the big bang.
Down
  1. 1. It is a cloud comprising of dust, plasma and gases present in all the galaxies, including our own.
  2. 2. Is a spiral galaxy that includes our solar system. It has billions of stars, including our Sun.
  3. 5. a phenomenon in which the spectrum of an astronomical object gets displaced towards the longer( red) wavelength.
  4. 6. These are structures that surround the celestial objects such as the stars and the black holes.These structures are made of gas, plasma and dust
  5. 7. Is a young star which is formed as a result of accretion in the nebula.
  6. 9. This is a Latin word for fog or cloud.It consists of interstellar clouds consisting of Helium, Cosmic Dust, ionised gases, hydrogen as well as molecular clouds. [There are in all 5 different types of Nebulae, namely;emission nebulae, reflection nebulae, dark nebulae, planetary nebulae, and supernova remnants.
  7. 10. It is defined using the equation: v = 2pir /T
  8. 12. self-luminous celestial objects, made of Hydrogen and Helium
  9. 14. Is a very bright, luminous, celestial and a stable star, situated in the spiral arm of the Milky Way galaxy and at the centre of the Solar System.
  10. 15. Is the term that tells us the time taken by one object to revolve around the other.
  11. 17. This refers to the space, time and matter and all the laws that govern them.
  12. 19. The circular movement of the Earth about its own axis