Habitability
The habitable zone around the sun will do this as the sun ages
Expand outwards
This method detects exoplanets by observing the planet block some of its host star's light
Transit method
This is the hottest planet in our solar system
Venus
Any molecule containing carbon is considered this
Organic molecule
This is a shortcut between two distant parts of the universe through hyperspace
Wormhole
This protects us from the sun's UV radiation
The ozone layer
The doppler effect tells us that stars moving away from us will appear this way.
Redder
This mechanism allows many Jovian moons to have subsurface oceans
Tidal heating
This process regulates Earth's climate long term
The carbon dioxide cycle
What term in the Drake equation do we have the most accurate value for?
Key evidence suggesting Venus once had liquid water comes from measurements of this in its atmosphere
Deuterium
This term refers to the energy radiated by an object that absorbs all incident radiation
Blackbody radiation
Due to this effect, water can move above the ozone layer and undergo photodissociation
The moist greenhouse effect.
This is the same for all observers in all frames
The speed of light
This is defined to be the minimum velocity required for an object to escape the gravitational pull of a body
Escape velocity
Without this a planet's atmosphere would be slowly stripped away by the solar wind
Magnetosphere
This technique detects an exoplanet by the wobble of its host star
Astrometric technique
The source of gas in Mars's atmosphere is unknown, but could possibly be a sign of life
Methane
This person realized the OBAFGKM stellar classification system was a temperature scale
Cecilia Payne-Gaposchkin
Why is Mars losing its atmosphere?
Lack of a magnetosphere
Changes in this planetary characteristic causes significant changes in the climate of mars over time
Axial tilt
This manmade object was the first to enter interstellar space
Voyager 1
This is the only moon with its own atmosphere
Early SETI efforts focused on 1420 MHz radio frequencies. This frequency corresponds to a signal from what natural source?
Neutral hydrogen
This effect allows moons like Europa to have their own magnetic field