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give me 5 things to know about the earth.
the earth is a planet that orbits the sun once every 365 days
the earths orbit around the sun is an ellipse that is close to being circular
the earth rotates on its axis which is tilted once in 24 hours
it takes one month for the moon to orbit the earth.
it takes 500s for the light from the sun to reach the earth.
how many seconds does it take for the light from the sun to enter the earth?
500 seconds
how long does it take for the moon to orbit the earth
one month
the earth is rotates on its axis that is tilted once in every?
24 hours
the planet earth orbits the sun every?
365 days.
explain the orbit of the earth around the sun in terms of its shape.
the earths orbit around the sun is an ellipse that is close to being a circular.
name the only star in our planet?
THE sun
what are the 8 planets and name them in order from the sun.
mercury
venus
earth
mars
jupiter
saturn
uranus
neptune
what is the 1st thing that happens in the lifecycle of a star
a star is from from a interstellar cloud of dust and gases that contain hydrogen
what is the 2nd thing that happens in the lifecycle of a star
a protostar is a interstellar cloud collapsing increasing in temperature as a result of its internal gravitational attraction.
what is the 3rd thing that happens in the lifecycle of a star
the protostar becomes a stable star when the inward force of gravitational attraction is balanced out by the outward force due to the high temperature in the centre of the star
what is the 4th thing that happens in the lifecycle of a star
all the stars eventually run out of hydrogen as fuel for nuclear reaction.
what is the 5th thing that happens in the lifecycle of a star
when most stars expand to form red giants while the more massive stars expand to form red supergiant when the hydrogen in the centre of the star has been converted to helium.m
what is the 6th thing that happens in the lifecycle of a star
the red giant from the less massive star forms a planetary nebula with a white dwarf at its centre.
what is the 7th thing that happens in the lifecycle of a star
The red supergiant explodes as a supernova forming a nebula that contains hydrogen and new heavier elements leaving behind the neutron nucleus or a black hole at its centre.
the final thing that happens in the life cycle of the star.
the nebula from the supernova may form new stars orbiting planets.
what is Milky Way
it is one of the billion of galaxies making up a universe and the diameter of this Milky Way is 100000 light years
in which galaxy is the sun found
the sun is a star which is found in the Milky Way galaxy
what is redshift
the observed increase in wavelength of electromagnetic radiation emitted by distant galaxies or stars. the more distance the galaxy, the faster it is moving ands the bigger the observed wavelength
what is the sun
it is a medium size star which consists of hydrogen and helium and it radiates most of its energy from infrared, visible light and ultraviolet light that are the regions of electromagnetic spectrum.
describe the start
the stars are powered by nuclear reactions that release energy and that in a stable star the nuclear reactions involve the fusion of hydrogen into helium
what are galaxies made of
billions of stars
how are astronomical distances measured
in light years
define light year
it is the distance travelled in a vacuum by light in one year
what are the 4 important planetary data-analysis
the strength of the gravitational field around the planet decreases as the distance increases.
most of the mass in the solar system is in the sun therefore the planets orbit it
the strength of the suns gravitational field decreases as the distance increases
the orbital speed of the planet decreases as the distance from the sun increases
define orbital distance
it is the average distance between a body and the sun.
