Audiobooks online: genre "Science Fiction", page 29

In his final adventure on Mars, Eric John Stark acquires a relic of an ancient Martian hero, a gem or lens which is believed to be the key to the strength of Kushat, the city that guards the Gates of Death in the frozen north. A brief inspection of the artifact plunges Stark int...

John Carter, an American Civil War veteran, goes prospecting in Arizona and, when set upon by Indians, is mysteriously transported to Mars, called "Barsoom" by its inhabitants. Carter finds that he has great strength on this planet, due to its lesser gravity. Carter soon falls in...

Five citizens of Terra were being held on other worlds -- and the ultra-secret Department 99 existed only to set them, and others like them, free. (Summary from text)...

An undercover Paratimer has disappeared on assignment while in an alternate time line, and it’s up to Verkan Vall of the Paratime Police to save her. To do so, he must infiltrate a universe in which assassination is an honorable profession, and reincarnation a scientific fact....

Triplanetary was first serialized in Amazing Stories in 1934. After the Lensman series became popular, Smith took his Triplanetary story and turned it into the first of the Lensman series, using it as a prequel to give the back story for the protaganists in the Lensmen series. He...

A doctor, an architect, an engineer, and a geologist step into a space car. In their new invention, they set off on an expediton to Mercury, planning to visit Venus on the return voyage. On Mercury they find a strange city eerily abandoned. Sculptures of giant figures alarm them....

Those convicted of the most heinous crimes are sentenced to the Humane Penalty: they are ejected from the airlock of a ship, to freeze in the icy chill of outer space. Death is instantaneous. But in some cases, not permanent. - Summary by Peter Eastman...

David Innes is a mining heir who finances the experimental "iron mole," an excavating vehicle designed by his elderly inventor friend Abner Perry. In a test run, they discover the vehicle cannot be turned, and it burrows 500 miles into the Earth's crust, emerging into the unknown...

Travelling at speeds close to that of light, spacemen lived at an accelerated pace. When one of the twin boys left the starship, he grew older while his twin in space barely aged. So the starship twin left the ship to find what happened to his brother who was aging away on ear...

In the summer of 1921, a disenchanted journalist escapes the rat race for a drive in the country. But Mr. Barnstaple's trip exceeds his expectations when he and other motorists are swept 3,000 years into the future. The inadvertent time travelers arrive in a world that correspond...

Chip Delany's 2nd novel -- the first is The Jewels of Aptor (1962) -- published by Ace Books in 1963. Set in the 35th Century, the survivors of a nuclear war live on the coastline and an island in a kingdom ruled by a royal family in disrepair. A young victim -- the son of a weal...

Machines are infallible. Humans are not. The crew of The Ambassador knew their ship could not possibly fail, but what of themselves? And how could they defend against an unknown enemy with unknown motives and superhuman abilities, intent on driving each one of them beyond his own...