How is it possible that orphan planets are potentially habitable, even though they do not orbit a star?
What will be an ideal response?
Even on Earth, there is plenty of life that survives without sunlight in the deep oceans or underground. Some of this energy is traceable to Earth's internal heat alone. Internal heat is retained on Earth-size planets for billions of years, meaning that even in the absence of a host star, the prospect of a subsurface liquid habitable region exists.
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The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on
a. observations of globular clusters. b. observations of open clusters. c. 21-cm radiation from H I regions. d. the rotation curve of the galaxy. e. the energy produced by Sagittarius A.
If the density of the universe is equal to the critical density, and H equals 50 km/s/Mpc, then the true age of the Universe is 13.3 billion years
a. True b. False Indicate whether the statement is true or false
In general, which things below are affected by a magnetic field?
A) charged particles or magnetized materials (such as iron) B) rocks of all types C) iron-bearing minerals only D) bases and liquids
Convection is a mode of energy transport between materials that requires close contact between the atoms
Indicate whether the statement is true or false