● ● ● Writing numbers in standard form. Writing numbers in scientific notation. Significant figures. ● S I units. Quantity Name Symbol mass Kilogram kg length metre m temperature Celsius C ● Unit conversions. Equality: 1 kg = 1000g Conversion factor: 1kg/1000g or 1000g/1 kg ● Big Bang Theory All matter that makes up our Universe originated from a single point- a very small dense and very hot point called a singularity. An explosive event caused matter from the singularity to spread out, forming the Universe that we exhibit today. This is the Big Bang Theory which is the currently accepted model of the Universe. ● ● ● ● Doppler Effect and Redshift. gravity Geocentric and heliocentric models of the Earth. Data analysis- Uncertainty.