A war on a planet where time passes slowly at the poles
48288
Short story; war where speed of time changes with distance from front line
126418
Story about encounter with hostile aliens
38545
Book series about preparation for a war at the Singularity
131436
Story about tricking the earth empire into saving hopeless aliens
148051
Time Dilation When In Orbit
22106
Prove that time for planet to fall into the Sun equals $\left( \frac { 1 }{ 4\sqrt { 2 } } \right)$ of the planet's period
40450
Sci-fi novel about man picked up by aliens to represent earth in battle against galactic invaders
99856
Time and tide wait for no man
80318
Benevolent aliens who (initially) refuse to show themselves
37150
Sci-fi novella where colonists begin to de-evolve - Mankind has reached limits of its evolutionary cycle
25210
Science fiction short story taking place in a universe with a higher gravitational constant
64989
Falling space debris defence systems in the Star wars universe
21278
Story about a probe sent outside the solar system, awaiting a signal from it
35597
How long would it take me to travel to a distant star?
131908
short story about astronauts/colonists in a hostile planet
145842
Mankind prepares for a war with aliens by warring among itself
46055
Short sci-fi story: aliens regret setting Earth's destruction in motion