Science - Universe
supernova
the colossal explosion that occurs when a star dies
meteorite
a mass of stone that has reached the earth from out of space
black hole
what is left after a very large star dies that is so dense that not even light can escape its gravity
quasar
lie near the edge of the observable universe/discovered in 1963/ emit lots of energy/ appear as the bright star-like objects associated with disrupted colliding and merging galaxies
planet
a celestial body that orbits a star which does not produce its own light or heat but relfects it
milky way
the name of our galaxy
nebula
a cloud of gas and dust amongst the stars
galaxy
a collection of stars
star
a celestial body that gives off light and heat
metor
pieces of stone or metal in space
pulsar
a rapidly spinning neutron star that gives off radio waves in space
what is the geocentric model?
geocentric is superseded description of the Universe with Earth at the center.
what is the heliocentric model
heliocentric is superseded astronomical model in which the Earth and planets revolve around the Sun
who created the geocentric model
Claudius Ptolemy
who created the heliocentric model
Nicolaus Copernicus
why was the heliocentric model accepted?
The Heliocentric Model was accepted because it better explained the concepts of space with evidence. Additionally, advancements in telescopic observations, particularly those made by Galileo as he discovered evidence to support this theory when he saw that Jupiter had four moon in orbit.
why was the gencentric model debunked
The geocentric model was abandoned because it couldn't explain the observed motion of planets accurately. This backward motion was better explained by the heliocentric model, where planets, including Earth, revolve around the Sun. Additionally, advancements in telescopic observations by astronomers like Galileo provided further evidence supporting the heliocentric model, leading to the eventual acceptance of this more accurate representation of our solar system.
luminosity
measures how much enegry leaves a star in a certain period of time
how to caculate light years
one lightyear =
- the no. of seconds in a year x 300,000km which =
9.4608 x 10 to the power of 12
what factors affects the luminosity of a star?
size
what factors affect the colour of a star
temperature
constellations
a group of stars that form a particular shape or picture
what is the electromagnetic spectrum?
the electromagentic spectrum is the spectrum of electromagnetic radition, a group of waves which visible light belongs to
2 types of radition used is the field of astronomy
visible light and radio waves
what is a light year
the distance that light travels in a year
what discoveries did galilei make with his telescope
- discovered that the moon is not smooth but mountainous and cratered
- juptier has 4 moons orbiting it
how does galilei discovery about jupiter help prove the heliocentric model
- galilei demonstrates that not all celestial bodies orbit earth which challenged the geocentric view
where are stars born
- stellar nebulas
what are rhe 2 possible products at the end of a stars life
black hole
neutron star
what is the big bang theory
the big bang theory is a model that explains the orgin of the universe. it states that the universe began as a extremely hot and dense point then expanded rapidly, still expanding to this day
what is a HR diagram
its a graph that illustrates the relationship that exists between the avwrage surface temperature of a star and theie absolute magnitude
what is absolute magnitude
measures the brightness of a celestial object if it were located at a standard distance of 32.6 light years away
what is apparent magnitude
measures the brightness of a celestial object as observed from earth, it depends of the eart luminosity and disrance from earth
what type of galaxy is the milky way
the milky way is a barred spiral galaxy
where is our galaxy located
our milky way is located in one of those spiral arms called the Orion Arm