astronomy Flashcards
what is the universe
theorticla ideas which explains all aspects of existence incl planets,stars,galaxies and the contenents of space and all mater and energy
celestail
Refers to all objects outside the earths atmosphere that can be seen in the sky excl man made satelites or space vehicles
galaxy
large collection of a few million stars and hundreds of stars and interstellar material all gravtationally interacting and roatating around one common galactic centre
solar system
Our solar system cosnsits of all objects that are held by the gravtational pull of our sun.
Light year
distance light travels in a vacuum in one year (10 trillion km
The speed of light
300 000km/second.Take sun rays 8 mins to reach earth
Dark Matter
dark matter exsistence only inferred from the claculations of the mass of galaxies
best time to plan a star gazing session
new moon
how many stars can you on a dark clear night
2500
how many planets can you see on a dark night
25
how many stars in the milky way
100 000 million stars
2 star constellation not visbale in the southern Hemispshere
Big dipper and North star
compostion of atmosphere
79% oxygen
21% nitrogen
boundry of atmosphere and space name and distance
100 km
karmin line
Is space a total void
No space is not a otal void it has eletrcomagnetic magnetic radiation that exisist as wellas low density particle of helium and nitrogen
orgin of the work galaxy
greek work galaktos which means milk
when did the milky way form
13 billion year ago
what is length ened to end of the milky way
100 000 light year end to end
all the star in the mliky visbale from earth
yes all the stars visble by the naked eye are in the milky way galaxy
What is the galatic centre of the milky wya and how far aways is it
Central point upon which the milky way rotets around.Aprroximtely 25000 to 28000 light year from earth
how do you find the galatic centre of the milky way
Found by looking towards the constellations of scorpio and sagigiturus there u will see a bright area in the milky way.
