How is energy produced in stars?
Energy is produced by thermonuclear fusion process in stars.
Short Q & A
Which type of information can be obtained by remote sensing satellites?
Information like geological survey of metallic ores in the earth’s crust, environmental changes, water resources, agricultural resources, diseases spread in crops, oceanic phenomena; etc can be obtained by remote sensing satellites.
What is remote sensing?
Remote sensing is a method by which information about a substance; matter or a phenomenon can be obtained using scientific instruments without direct contact with them.
What type of rocket is required to carry heavy payloads?
A multistage rocket is required to carry heavy payloads.
What is ‘pay-load’?
‘Pay-load’ includes all scientific equipment, satellite, etc. that is carried by a rocket (or a spacecraft) to the space.
Give an example of a solid fuel used in a rocket.
A powdered mixture of aluminium and ammonium perchlorate (or ammonium nitrate) is used as solid fuel in a rocket.
What is used as liquid fuel in rockets?
A mixture of liquid hydrogen and liquid oxygen is used as liquid fuel in rockets.
What is the basic concept (belief) of Steady-state theory?
The Steady-state theory believes that the Universe appears the same at all times and remains unchanged.
How many years ago did Big Bang take place?
The Big Bang took place about 13.7 billion years ago.
On what does the rate of receding away of galaxies from one another depend?
The rate of receding away of galaxies from one another is directly proportional to the relative (intergalactic) distance between them.