The gravitational force between two masses m1 and m2, separated by a distance r, is F. The mass m1 is then reduced to three-fourth of its initial value.
To keep the gravitational force constant without changing m2, the separation r should be
increased to r
decreased to r
Proxima Centauri is at a distance of.......light years from the earth.
4.5
4.2
4.6
none of these
The unit used to measure the distance between planets is
light year
Angstrom unit
Astronomical unit
Fermi
The outer surface of the Sun visible to us is
chromosphere
photosphere
corona
convection zone
The star nearest to the Earth after the Sun is
Regel
Sirius
Betelguesse
Proxima Centauri
According to Big Bang theory, all the celestial objects existed at a certain point which is
expanding into the present day universe
contracting into the present day universe
located in the middle of the Milky Way
located in the middle of the Solar System
Age of the Sun is
4.65 billion years
5.20 billion years
4.40 billion years
4.25 billion years
The force of gravity is____ force that is ______ proportional to the ______ of the distance between the two given masses.The information in which alternative completes the given statement?
a repulsive, inversely , square
a repulsive, directly, cube
an attractive, inversely , square
an attractive, directly , cube
Stars are formed in
Ceres
Nebula
Andromeda
None of these
The central part at which numerous stars are concentrated is called
Supernova
Perihelion
Galactic bulge
Apastron
