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Ch 12 - Beyond Earth6th Science
Galaxy
What constitutes a 'Galaxy' in astrophysics?
What constitutes a 'Galaxy' in astrophysics?
DEFINITION
Definition
- A massive, gravitationally bound system containing millions to billions of stars.
- It also contains interstellar gas, dust, and dark matter.
- Example: The Milky Way is the galaxy that contains our Solar System.
Prism Memory Hook
Galaxy = Gravity's Giant Group
Milky Way Galaxy (Akasha Ganga)
What is the Indian name for the Milky Way Galaxy, and how does it appear in the night sky?
What is the Indian name for the Milky Way Galaxy, and how does it appear in the night sky?
FACT
Appearance and Name
- Indian Name: Ākāśha Gangā (Ganges of the Sky).
- Appearance: It appears as a faint band of white light stretching across the night sky.
- Significance: It is the galaxy that contains our Solar System along with billions of other stars.
Prism Memory Hook
Akasha = Sky, Ganga = River
Star
What is the scientific definition of a 'Star'?
What is the scientific definition of a 'Star'?
DEFINITION
Definition
- A celestial object made of hot gases that produces its own heat and light (self-luminous).
- Example: The Sun is the nearest star to Earth.
- Observation: They appear as twinkling points of light from Earth due to atmospheric refraction and their immense distance.
Prism Memory Hook
Star = Self Luminous Sphere
Also in this chapter
44 more cards to study in Prism
- 4Visibility of Stars in Daytime
- 5Proxima Centauri Distance
- 6Sirius and Canis Major
- 7Constellation
- 8The Big Dipper (Saptarishi)
- 9The Pole Star (Dhruva Tara)
- 10Orion Constellation
- 11The Solar System
- 12Astronomical Unit (AU)
- 13Planet Definition
- 14Planetary Illumination
- 15Order of Planets
- 16Inner vs. Outer Planets
- 17Venus: The Brightest Planet
- 18Earth: The Blue Planet
- 19Rotation vs. Revolution
- 20Mars: The Red Planet
- 21Moons of Mars
- 22Jupiter
- 23Saturn's Rings
- 24Exoplanets
- 25Satellite
- 26Moon's Synchronous Rotation
- 27Phases of the Moon
- 28Solar and Lunar Eclipses
- 29Lunar Surface Characteristics
- 30Indian Artificial Satellites
- 31Dwarf Planets and Pluto
- 32Asteroids and the Asteroid Belt
- 33Comets
- 34Halley's Comet
- 35Trans-Neptunian Objects
- 36Meteoroids, Meteors, and Meteorites
- 37Geocentric vs. Heliocentric Models
- 38Nakshatras
- 39Ardra and Krittika
- 40Rohini Nakshatra
- 41Indian Nomenclature for Planets
- 42Ideal Stargazing Conditions
- 43Light Pollution
- 44Hanle Observatory
- 45Astronomy Ambassadors
- 46Chandrayaan-3 Historic Achievement
- 47National Space Day
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6th Science
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