The outer Jovian planets most likely formed from
A) clumps of hydrogen and helium gas spun from a rapidly rotating protosun
B) larger collections of hydrogen and helium gas attracting particles of rock and ice to them
C) the collision and coalescence of clumps of hydrogen and helium gas within the solar nebula
D) planetesimals of rock and ice attracting hydrogen and helium gas from the solar nebula
Question 2
What is the definition of a star's habitable zone?
A) the range of distances from the star where planets with life have been detected
B) the range of distances from the star where rocky planets can form
C) the range of distances from the star where organic molecules can be stable on the surface of a suitable planet
D) the range of distances from the star where liquid water can be stable on the surface of a suitable planet
The Sun and the Planets
Liquid helium
The Magnetic Fields of Five Planets
A Prototype Hydrogen Fuel Cell Car
Terrestrial Planets "الكواكب الأرضية"
Reflectivity of Inner Planets