Physics & Astronomy
abrasives
6%
aldehydes
8%
alkanes
6%
alkenes
5%
ambiguity
5%
amino acids
17%
asteroids
15%
atmospheres
5%
bombardment
6%
carbon
5%
causes
6%
charged particles
9%
chemical energy
7%
clathrates
18%
coma
15%
comets
36%
conductors
5%
contamination
5%
critical mass
7%
crusts
10%
delivery
25%
Earth atmosphere
10%
Earth mantle
9%
Earth rotation
17%
Earth surface
8%
eclipses
6%
electric power
18%
embedding
5%
Enceladus
8%
energy conservation
6%
energy sources
9%
erosion
5%
estimates
8%
Europa
100%
exobiology
21%
explosions
15%
extraterrestrial environments
5%
extraterrestrial life
7%
extraterrestrial oceans
11%
gravitational fields
5%
habitability
7%
Halley's comet
21%
hazards
6%
heating
12%
homopolar generators
10%
Hubble Space Telescope
6%
hydrates
6%
hydrocarbons
12%
hypervelocity
7%
ice
57%
induction heating
9%
information theory
6%
infrared spectra
8%
infrared spectroscopy
5%
irradiation
13%
Joule heating
6%
Jupiter (planet)
10%
lightning
7%
liquids
5%
Lorentz force
6%
loss of coolant
8%
magnetic fields
7%
magnetic induction
8%
mars
14%
meteorite collisions
10%
meteorites
5%
molecules
6%
natural satellites
15%
oceans
45%
organic solids
18%
planetary protection
10%
planetary surfaces
8%
planetary systems
7%
plutonium 239
10%
Poynting theorem
9%
radar
6%
relativity
5%
salinity
9%
solar system
37%
space exploration
7%
spores
7%
superconducting magnets
6%
synthesis
6%
thermal emission
8%
unified field theory
8%
uranium
5%
water
10%
whales
8%
Earth & Environmental Sciences
aldehyde
5%
amino acid
14%
clathrate
16%
comet
33%
crust
5%
disequilibrium
6%
dust
5%
early Earth
24%
Enceladus
8%
energy
9%
energy source
12%
Europa
82%
exobiology
9%
heating
18%
hydrocarbon
6%
ice
34%
impactor
8%
infrared spectroscopy
6%
irradiation
14%
Jupiter
8%
lightning
5%
mantle
6%
Mars
12%
meteorite
10%
Moon
13%
obliquity
6%
ocean
22%
organic matter
7%
origin of life
26%
oxidant
9%
particle
8%
persistence
5%
planetary atmosphere
6%
planetary satellite
9%
planetary surface
7%
racemization
8%
RNA
5%
saltation
7%
shell
13%
solar system
31%
spore
5%
treaty
6%