6) Space Physics Flashcards
Define Rotation of Earth:
The circular movement of the Earth about its own axis is called as the rotation of the Earth.
Define Average orbital speed:
It is defined using the equation: v = 2??r /T where r is the average radius of the orbit and T is the orbital period
Define Solar system
Solar system 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.
Define Orbital distance:
Orbital distance is the term that tells us the time taken by one object to revolve around the other.
Define Orbital duration[ Orbital time}:
Orbital duration is the time taken by one object to completely orbit around the other.
Define gravitational field strength:
Gravitational field strength 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”
Define Interstellar clouds of gas and dust:
It is a cloud comprising of dust, plasma and gases present in all the galaxies, including our own.
Define accretion disc
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
Define Planetary data:
It refers to the data that gives us information on the different planets based on researches and explorations
Define Stars:
Stars are massive , self-luminous celestial objects, made of Hydrogen and Helium
Define Proto stars:
A protostar is a young star. .It is formed as a result of accretion in the nebula.
Define Stable stars:
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.
Define Sun:
The Sun 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.
Define Galaxy:
The word galaxy 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.
Define Milky way:
Milky way is a spiral galaxy that includes our solar system. It has billions of stars, including our Sun.