Earth In Space

Ice-covered rocky structure that orbits the sun

Very large rock found in space in the asteroid belt between mars & jupiter

Natural structure that orbits a planet

Structure in orbit around a star

Elliptical path of structure travelling around star/planet

Massive extra-terrestrial structure that emits light & radiation

Communications Observing earth Weather monitoring Astronomy

Force of attraction that exists between objects

Mass of objects - bigger objects, larger force of gravity Distance between objects - force of gravity decreases as distance apart increases

Weight = mass x gravity

• Cloud of hydrogen comes together under force of gravity • As hydrogen is compressed, becoming very dense; its temperature rises to many million degrees • At high temperatures, nuclear fusion occurs & hydrogen nuclei combine to form heavier nuclei such as helium • This nuclear fusion emits light & heat/radiation

Distance travelled by ray of light in 1 year

Phenomenon of light spectrum different galaxies being shifted towards red end of spectrum

The larger the red-shift

Universe started as tiny point, called singularity , about 14 billion years ago Big Bang represents massive cosmic explosion that expelled matter & energy in all directions out from its central point Over millions of years, gravity pulled the scattered together together to form galaxies , stars, a planets & moons Forces involved area causing universe & space to continue to expand Evidence of this is red-shift of distant galaxies

The Steady State Theory - proposes that universe hasn’t changed so much over time & had no significant beginning. Suggests new matter is constantly created as universe expands. Most scientists don’t support theory as red-shift can’t be explained