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Friday, 20 April 2018
Sound
Sound
Sound is
produced by the vibrations of an object or mechanism and transmitted in the
form of waves—alternating increase and decrease in pressures. It radiates
outward through a material medium of molecules, more or less like the ripples
spreading out on water after some he7vy object has been thrown into it. The
frequency of sound is determined by the number of times the vibrating waves
undulate per second. The Slower the cycle, the lower...
Friday, 13 April 2018
Satellites
Satellites
Alifye - Satellites - Space & Astronomy
Artificial Satellite
It is a man-made object orbiting a planet or the Su the Earth's first
artificial satellite, Sputnik 1. was. launched by the USSR on Oct. 4, 1957. The
first U.S satellite was Explorer I launched on January 31, 1958. Artificial
satellites have also been launched to move round the Moon, Mars, Venus and the
Sun.
Communications Satellite
It is a satellite...
Thursday, 1 February 2018
Black Holes
Black Holes:
When a star with a mass more than 20 times that of the Sun
explodes as a supernova, it may leave behind a core so massive that even a
neutron star is not its final state. The object's gravity may be so great that
it goes on collapsing for ever, crushing the matter within it to an
unimaginable state. As the object's density gets greater and greater, the force
of gravity rises even more until nothing can escape — not even light....
Stars
Stars:
Stars form from gigantic clouds of gas and dust which are
scattered throughout the spiral arms of our galaxy and in other galaxies. Many
of these clouds appear to be dark. One such dark cloud is the Coal. Sack nebula
in the constellation_ of the Southern cross. A cloud starts to form into stars
when it becomes dense enough to collapse under the inward pull of its own
gravity. As the cloud falls together, it separates into knots and clumps,...
Wednesday, 31 January 2018
Effects Of Moon On Earth:
Effects Of Moon On Earth:
Eclipses:
The shadows the Earth and Moon throw in space cause total or
partial eclipses of the Moon and Sun.
Lunar Eclipse:
Earth revolves round the Sun and the Moon
revolves round the Earth, being its satellite. Clearly many a time the Earth
comes between the Sun and the full Moon casting a shadow on the Moon. This is
called an eclipse of the Moon.
Solar Eclipse:
A solar eclipse can take place when the
Moon...
Saturday, 27 January 2018
The Moon
The Moon:
The Moon is the Earth's only natural satellite.
Compared to •satellites of other planets, it is very large in relation to its
parent planet. It is a quarter of the Earth's diameter measuring 3476 Km. Its
distance from the Earth is 384,405 km. It orbits the Earth once a month,
keeping the same face turned towards Earth as it does so. Its surface is pitted
with craters caused by Meteorites. Moon is the same age as the Earth about
4,600...
Pluto
Pluto:
Diameter at
equator--- about 6,000Icm.
Means distance from Sun- 5.900 million km.
Orbits
Sun in ---- 247.7 \tars.
Rotates on axis in--- 6 days 9 hours
Number of
satellites- 0.
Mass--- 0.1 times that of Earth.
Surface gravity-- not known.
Alifye - The Solar System - Pluto
It is farthest from Sun—the outermost planet. Its distance from the Sun varies
widely from the average. At its closest_ it crosses the path of Neptune. making
Neptune...
Neptune
Neptune:
Diameter at equator---
49500km.
Means distance from Sun- 4496.6 million km.
Orbits Sun in --- 164.8 years.
Rotates on axis in--- 16
hours.
Number of satellites- 2.
Mass--- 17.2 times that of Earth.
Surface
gravity---- 1.18 times that of Earth.
Alifye - Solar System - Naptune
It is a large planet lying near the edge
of the solar system. Under its cloudy blanket there is believed to be a core of
rock sheathed with ice stretching...
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