space key words and their meanings

Flashcards by justbuysomemilk, updated more than 1 year ago
Created by justbuysomemilk over 7 years ago


P1 revision: The Earth in the universe key words

Resource summary

Question Answer
Asteroid A dwarf rocky planet, generally orbiting the sun between the orbits of Mars and Jupiter
Big Bang A huge explosion of a single mass of material. This is the accepted scientific explanation for the start of the universe
Fusion A nuclear reaction where two small nuclei join, releasing energy. Fusion happens in the centre of the sun.
Light pollution Light created by humans. It prevents city dwellers from seeing most stars. It also causes problems for astronomers.
Light year distance traveled by light in a year
Milky way The galaxy in which we live. It is seen from Earth as a 'milky' stripe in the sky (due to light from all the stars)
parallax The apparent shift of an object against a more distant background, as the position of the observer changes
Red Shift When radiation is observed to have longer wavelengths than expected
Solar System The sun and the objects that orbit it -planets and their moons, asteroids and comets
Universe All things(including the earth and everything else in space)
nucleus The central core of the atom involved in nuclear reactions such as the fusion reactions that take place in stars
Galaxy a collection of thousands of millions of stars
commet A rocky lump of frozen gasses and water that orbits the sun
Nebula A cloud of dust and gas found between stars. They are often regions where new stars are formed
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