Physical Sciences Flashcards
(23 cards)
Origin of universe. G
Big bang theory.
Small drop
Future of universe
Steady state theory
Expanding universe theory
Circular University theory
Steady theory
Universe has existed and will be exist forever
Accepted till 17 th century
Expanding universe theory
Universe is expanding and will expand until all the helium and hydrogen is consumed.
Circular Universe theory
Universe is expanding but a time will come when it contracting back till all the energy will form a ball again.
Galaxy
Huge collection of star held together by gravity. Total 125 billion glaxies . The centre part of galaxy is nucleus.
Classification of galaxies
Elliptical galaxies
Spiral glaxies
Irregular galaxy
Milky galaxy.
Elliptical galaxies
Globular shape with a bright nucleus
Contain a population of old stars little dust and gas.
Elliptical galaxies
Globular shape with a bright nucleus
Contain a population of old stars little dust and gas.
Spiral glaxies
Contain news bright stars with some old stars
Held together with dust, gas and molecular stars.
Irregular galaxy
Large amount of gas, dust and young stars but no regular arrangement.
Cluster and superclusters glaxies
Arrange in clusters Milky glaxay is part of it.
Cluster and superclusters glaxies
Arrange in clusters Milky glaxay is part of it.
Milky glaxay
Large spiral galaxy. Consist of new stars measuring about 10000 light year across.
Solar system
Planets , satellites, aseetroids, comets, dawraft planets.
Sun
Closest Star to earth, contains no solid material,
Formed 5 billion years ago from a cloud of gas and dust
Interior of the Sun
Core,( nuclear fusion took place here 150 times dense as water) radiation zone. ( Gases moved outward), convection zone ( , (motion of gases carry out enery to upward) photosphere (shinning surface of sun).
Earth
Structure
Crust , mantle, Outer core, Inner core.
Revolution of earth
Revolves around the sun competes one revolution in 365.25 days revolves in anti clock direction .
Revolution causes season change.
Rotation of around its on axis
Rotates in its on axis from West to East . Causes variation of days and nights.
Solar eclipse
When moon comes between sun and earth
Types of solar eclipse
Partial
Full solar eclipse: full shodaw of moon falls on earth.
Darker zone is called Umbra
Lighter zone is called penumbra.
Lunar eclipse
When earth comes between the moon and sun
