Vocabulary# 8 The inner solar system

planet: a large body orbiting a star , such as the Sun.

asteroid: a rocky, metalic object that orbit the sun.

solar system: a star such as the sun, and all objects orbiting it.

Kepler laws: laws that summarize the movment of the planets.

Vocabulary#7 The Moon in Motion

phase of the Moon: the shape of the lighted part of the Moon seen from Earth at any time.

lunar eclipse: a blocking of a view of the full moon when the moon passes into Earth shadow.

Solar eclipse: a bloking out of a view of the sun when the earth passe throught the moon shadow.

tide: the regular rise and fall of the water level along a shorline.

Vocabulary# 6 Earth and Sun

Voc6

 

rotation: a complete spin on an axis.





International Date Line: the 180 line of longitude.

standard time zone: a belt 15 wide in longitude in which all places have the same time.

revolution: one complete trip around the sun.

Vocabulary# 5 Tools of Astronomer

Universe: everything that exist.

 

telescope: a divice that collects light and make distance objects appear closer and larger.

 

refraction: the bending of waves as they go from one substances to another.

 

reflection: the bouncing of waves off a surface.

wavelength: the distance from one peak to the next on a wave.

 

frequency: the number of waves that pass through a point in a second.

 

electromagnetic spectrum: waves of light in order by wavelength.

Astronomy

Astronomy is a natural science that deals with the study of celestial objects (such as stars, planets, comets, nebulae, star clusters and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation). It is concerned with the evolution, physics, chemistry, meteorology, and motion of celestial objects,

 as well as the formation and development of the universe. 

 Astronomy is one of the oldest science.

 Prehistoric cultures left behind astronomical artifacts such as the Egyptian monuments and Stonehenge, and early civilizations such as the Babylonians, Greeks, Chinese, and Indians performed methodical observations of the night sky. However, the invention of the telescope was required before astronomy was able to develop into a modern science. Historically, astronomy has included disciplines as diverse as astrometry, celestial navigation, observational astronomy, the making of calendars, and even astrology.

Information from : Wikipedia
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How Levers Work

Simple machine :  a device with few parts that makes it easier to do work.
Effort force :  the force applied to do a machine.
Resistance force :  the force that a machine acts against.
Lever : a simple machine made of a rigid bar on a pivot point.
Fulcrum:  the pivot point of alever.
Mechanical advatage: The number of times a mchine multiplies the force applied.
Pulley :  a grooved wheel that turns by the action of arope in the groove.
Wheel and axle : a simple machine made of a handle or axis attached to the center of a wheel.

Energy and Work

Potentional energy :  the energy stored in an object or material.
Gravitational potentional energy:  the potentional energy of an object located above the ground.
Kinetic energy:  the energy of amoving object.
Work :  force applied to an object times the distance the object moves.