Starlight
300,000 km/s, universal "speed limit".
What is the speed of light?
The main factor that determines the life sequence of a star.
What is mass?
The theory that the universe began 13.7 billion years ago with a massive expansion.
What is the Big Bang theory?
Atmosphere, Hydrosphere, Biosphere, Geosphere.
What are the Earth Spheres?
The gas that has increased by about 30% in the last 150 years due to human activity.
What is carbon dioxide?
A measure of distance equal to how far light travels in one year.
What is a light-year?
The stage our Sun will enter before becoming a planetary nebula.
What is a red giant?
The observation that galaxies are moving away from us, with their light stretch to longer wavelength.
What is redshift?
The continuous movement of water through evaporation, condensation, precipitation, and infiltration.
What is the water cycle?
A greenhouse gas that is naturally abundant but not mainly caused by humans.
What is water vapour?
How bright a star appears from Earth.
What is apparent magnitude?
The two possible end products of a massive star after a supernova.
What are neutron stars and black holes?
The theory that claimed the universe has always existed and looks the same on a large scale.
What is the Steady State theory?
The movement of carbon through geological processes such as sedimentation, fossil fuel formation, and volcanic release over millions of years.
What is the long-term carbon cycle?
The type of radiation trapped and re-emitted by greenhouse gases.
What is infrared radiation?
Brightness of a star when viewed from 10 parsecs.
What is absolute magnitude?
The Sun is currently here on the Hertzsprung-Russell diagram.
What is the main sequence?
The faint glow of radiation left over from the early universe, filling space in all directions.
What is the Cosmic Microwave Background?
The movement of carbon through processes such as photosynthesis, respiration, decomposition, and ocean exchange.
What is the short-term carbon cycle?
Actions such as planting trees, using renewable energy, and improving energy efficiency.
What are strategies to reduce greenhouse gas emissions?
The brightest star in the night sky, with an apparent magnitude of –1.4.
What is Sirius?
Stars that are very hot but very dim.
what are white dwarfs?
The further a galaxy is from Earth, the faster it is moving away.
What is Hubble's Law?
Mulching, wetting agents, night irrigation, intelligent irrigation, "cycle and soak".
What are water management strategies at Mt Cootha Botanical Gardens.
Melting ice reduces reflectivity (albedo), causing more warming and more ice to melt.
What is a feedback loop?