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The mysterious planet,

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"The wanderer gleamed balefully in the sky - was it a new world for Man or a messenger of ultimate destruction?" Planet X discovered out beyond Pluto - "... if the might of the Federation met the advanced weaponry of the aliens... the inevitable clash would surely destroy all life in the solar system!"

209 pages, Unknown Binding

First published January 1, 1953

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About the author

Lester del Rey

635 books117 followers
Lester del Rey was an American science fiction author and editor. Del Rey is especially famous for his juvenile novels such as those which are part of the Winston Science Fiction series, and for Del Rey Books, the fantasy and science fiction branch of Ballantine Books edited by Lester del Rey and his fourth wife Judy-Lynn del Rey.

Also published as:
Philip St. John
Eric van Lihn
Erik van Lhin
Kenneth Wright
Edson McCann (with Frederik Pohl)

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Displaying 1 - 18 of 18 reviews
Profile Image for Craig.
6,291 reviews178 followers
February 3, 2021
The Mysterious Planet was one of the novels that del Rey wrote for the Winston line of science fiction adventures intended for a younger audience. It features Bob Griffith, a cadet in the Solar Federation Navy, which leads to speculation that it was perhaps partially influenced by the successful novel by Robert A. Heinlein from 1948 that had spawned the wildly-popular Tom Corbett hero of radio, television, and comics, not to mention his own book series. In del Rey's book, Bob defies his orders because he knows his hunches are correct, and drafts a crazy, rich playboy to take him to Planet X on his yacht to meet the aliens and try to avert disaster. It's not the smoothest or most carefully thought-out plot that he ever devised, but his writing is crisp and enjoyable, and it's a fast, fun space opera adventure. The book was originally published under the pseudonym of Kenneth Wright, and didn't appear under his own name until 1978, when Del Rey Books (!) released its first paperback edition, which sported a terrific Dean Ellis cover.
Profile Image for Michael.
1,235 reviews43 followers
November 21, 2016
A great read from the Golden Age of Science Fiction. Lester Del Rey was one of the Masters of science fiction. He was one of the first science fiction authors I ever read as a child. His books were in my school library along with other greats such Heinlein, Clarke, Asimov, Pohl etc. If you like Golden Age science fiction I recommend this book. It is a quick, fun read when space was as we all wanted it to be instead of the reality we know it to be.
Profile Image for Tentatively, Convenience.
Author 16 books245 followers
November 6, 2019
review of
Lester Del Rey's The Mysterious Planet
by tENTATIVELY, a cONVENIENCE - November 3-6, 2019

It seems that when I think of Del Rey I think of him more as an SF editor than as a writer. Why, I don't know b/c most of what he edited was somewhat obscure & he was a prolific author.

"He later became an editor for several pulp magazines and then for book publishers. During 1952 and 1953, del Rey edited several magazines: Space SF, Fantasy Fiction, Science Fiction Adventures (as Philip St. John), Rocket Stories (as Wade Kaempfert), and Fantasy Fiction (as Cameron Hall). Also during 1952, his first two novels were published in the Winston juvenile series, one with an Italian-language edition in the same year.

"In 1957, del Rey and Damon Knight co-edited a small amateur magazine named Science Fiction Forum. During a debate about symbolism within the magazine, del Rey accepted Knight's challenge to write an analysis of the James Blish story "Common Time" that showed the story was about a man eating a ham sandwich. Del Rey was most successful editing with his fourth wife, Judy-Lynn del Rey, at Ballantine Books (as a Random House property, post-Ballantine) where they established the fantasy and science fiction imprint Del Rey Books in 1977."

- https://en.wikipedia.org/wiki/Lester_...

At any rate, I barely know his writing at all, having only previously read a short story collection called The Best of Lester Del Rey. I begin my review of that w/ this:

"Lester del Rey's the kind of writer I might've read in my early teens (but didn't) & then decided that he represented the kind of SF that all SF seemed to me to be at the time: sortof interesting but not that well written or experimental. I wd've then moved on - remembering him w/ some affection but not in any hurry to read more.

"Now that I'm 44 yrs past my early teens, del Rey still strikes me that way but I've read so many other things by now that I can respect del Rey just for being what he was: a somewhat generic, but still inspired, SF writer."

- https://www.goodreads.com/review/show...

The Mysterious Planet is, as far as I can remember, the 1st novel I've read by him. It's about time. The 1st paragraph:

"It was a fine morning on Mars, clear, crisp and cold. In a little over a hundred years the great air factories had increased the oxygen content until it could be breathed without a mask, and had added enough carbon-dioxide gas to let the air collect and hold the faint heat of the sun. Now it was like a morning high in the mountains of Earth." - p 1

Ok, I'm always interested in the details of terraforming. I don't let conerns about the negative effects on the local eco-system spoil my fun. But did Mars get mad?!

""Took just four days to get here from Earth," Simon went on. "Like a dream. You come on the Mars Maid? Yeah, I thought so. Boy, I wouldn't travel on a liner after riding this! The minute Dad got my unlimited pilot's license fixed—took plenty of greasing to do it—the very minute, off I took. And here I am!"

""Yeah, here you are," Bob agreed, without enthusiasm. He wondered if Jakes had any idea of how sickening the idea of bribing officials for an unlimited license was." - p 3

The "Mars Maid" part is presumably a reference to Edgar Rice Burroughs:

" Thuvia, Maid of Mars is a science fantasy novel by American writer Edgar Rice Burroughs, the fourth of the Barsoom series. The principal characters are Carthoris (the son of John Carter of Mars) and Thuvia of Ptarth, each of whom appeared in the previous two novels." - https://en.wikipedia.org/wiki/Thuvia,...

As for the immediate class conflict w/ the main character's being repulsed by the secondary character's privilege? I like it. This awkwardness continues when the privileged one gives t'other a present.

""Whew! Thought I'd missed you. Here!" He shoved a box into Bob's hands awkwardly. Bob turned it over and finally opened it. Inside was an officer's pocket-knife, a marvel of compactness that held twelve tools, from scissors to tiny pliers, as well as standard blades. Beside it lay one of the tiny, expensive little personal radios issued to the higher officers." - p 14

I took it for granted that it was probably rigged somehow. Things become mysterious.

"They went back silently. It was completely impossible for the pirates to have taken all the freight and every man on board the ship off in no more than the single minute they had been locked together. Yet it had happened. Everything was beginning to come out the same—the events were impossible, but the black ship had done them, all the same." - p 28

"The shock was worse than any monster could have given them. The alien from Planet X looked almost exactly like a human!

"He was a short man, and his knee joints looked a little wrong; there wasn't the usual knobbiness. The hand that held some kind of a weapon had four normal fingers, but there was a thumb opposite the regular one, giving him a double palm. Yet even the fingernails were there. Generally, his body seemed almost completely normal. His ears were a bit too large, and there was no hair on his head, while his eyes had a vaguely Asiatic slant to them. His skin was an orange shade, not too different from some jaundiced people, but still unmatchable on Earth.

"Yet even on Earth, he would hardly have attracted a second glance. He was dressed in something like a Scotch ceremonial kilt of solid blue, with a soft T shirt and a brief cape. On a wide belt at his waist, several pouches were sewn. The costume was no odder than the man." - p 111

But did he speak English?

Perhaps my favorite part of all this is the description of the Thule music.

"It came while they were out. They got back to hear something that was a cross between an anguished cat and a tin can being battered around by a stumble-footed mule. In between sections, for no reason, a female voice would come on in a high, nasal singsong.

"If there was any rhythm to it, it couldn't be found, except for a few sections where there was obviously srudied effort to make a pattern.

"When they threw the door open and rushed in to shut off the racket, Juan was lying there with a smile of sheer pleasure on his face, beating his hand up and down as crazily as the beat of the so-called music. He let out a squawk when they cut it off.

""Hey, I want to hear all of how it goes," he cried, "This is interesting music."" - pp 140-141

Been there. The people who know & understand music the least are always the ones to oppress those of us who understand & know it the best. Of course, this makes Juan a suspicious character. I just hope his side wins.

My initial impression was that this was like Heinlein, perhaps like his Space Cadet (see my review here: https://www.goodreads.com/book/show/3... ) insofar as it has good clean American characters in outer space still representing those good clean American values as put forth in propaganda of the 1950s. While I may have an imaginary wry grin to inflect my writing of that it doesn't mean that I didn't like it.
Profile Image for Dayna Smith.
3,246 reviews11 followers
August 17, 2016
A charming science fiction tale written in 1953 in the middle of the Cold War. Mankind has populated the solar system. Our outpost on Neptune discovers a planet beyond Pluto moving our way. Planet X does not seem to have a regular orbit and seems to be heading toward Earth. The Solar Federation Navy sends a group of ships to investigate. When the ships are attacked it becomes clear Planet X is inhabited - but by whom? Are they peaceful or warlike? Will a simple misunderstanding lead to war or can three teenage boys save the day? A little dated, but still a most enjoyable story. Boys should like this one! For those of us who are older the nostalgia is a treat.
Profile Image for Dylan Graham.
165 reviews2 followers
January 10, 2021
This story doesn’t quite have the allure of most of Del Rey’s others, but I believe that is because it is focused to more of a youth audience. With that said, it was still a great story, just a little less mature!
Profile Image for Little Timmy.
7,376 reviews59 followers
February 16, 2016
Great SiFi story by one of the master in the field. This is a great beginner book for someone younger or new to SiFi. Recommended
Profile Image for Charles Rene.
24 reviews
September 7, 2018
I enjoyed the story, and I liked that it ended differently than I was expecting, but I gave it a lower rating because of how the story is paced. It picks up very quickly, has a lot of little ups and downs that don't really lead anywhere, and then the crescendo happens on almost the last page and it feels very sudden and a little forced. There was also a plot twist that I picked up on very early on that wasn't revealed until the last second, and this was also not given very much attention at all for how important of a twist it was. Seems like a very hastily written book, even for a 50's pulp novel. A common thing to do in those days, though, was to write a story a chapter at a time for a pulp fiction magazine, and then if it became popular enough it was reprinted into a paperback without any editing. This can lead to a slightly haphazard over-arching story, which is what may have happened here.
Profile Image for Austin Tousley.
22 reviews
October 4, 2025
Sooooo much propaganda. But it's from the 1950s so yk. Probably written in response to WW2. If you look past the political commentary it's pretty good.
Profile Image for Neil.
1,317 reviews16 followers
March 8, 2016
I did not realize I had read this when I was younger; apparently "Kenneth Wright" is the pen name [or, one of the pen names] of Lester del Rey. It was a fun read; it was most assuredly geared towards young adults! It follows the 'adventure' of three young men in outer space. It moves at a decent pace; it held my interest throughout the entire story. It was pretty mild, all things considered. Of course, there as a happy ending.

One of the young men [last name of Griffiths] is the son of a commander in the Space Navy who is leading a fleet to an outpost past Jupiter. He is a cadet in the Navy and looking forward to traveling with this father to explore this mysterious planet. He takes after his father; is very by-the-book yet willing to bend the rules if the end result is justifiable.

The son encounters a rich kid [Simon Jakes] who was kicked out of the Academy; Jakes is a natural pilot who flies by the 'seat of his pants' and has his own spacecraft he is going to fly out to Planet X in order to explore it. He ends up joining Griffiths and Griffiths father on Neptune. He is described in a neanderthalic fashion, yet has his heart 'in the right place'. The two end up becoming friends.

An unknown planet has been discovered heading for the Solar System, so the fleet goes out to investigate, leaving from Mars orbit to head to Neptune. It turns out the planet is under an alien intelligence's guidance, and they want to join the Solar System. After a series of misadventures and misunderstandings, peace prevails.

Earth is an undergo, on the one hand, as the alien's tech is so far and above humanity's technological abilities. It is pretty crazy! The discussions of the alien tech was interesting, as was the descriptions of the humanoids inhabiting the planet.

I thought it was interesting that humanity had managed to colonize Mars and Venus before nearly fighting a three-way planetary war; peace prevailed. Much of the book keeps talking about how intelligent races, how advanced races, always look for peaceful solutions to problems and that war is always the last resort [as it is seen as the first resort of barbarians and less-advanced beings]. Both the Thulians [the aliens on Planet X] and the humans keep talking peace while advancing toward war; it takes drastic efforts to prevent a war from breaking out. It is kind of comical, in a way, as both sides are so 'advanced' and yet so clumsy.

On a completely side note, I thought it was hilarious that Griffith's father was often described as smoking a pipe throughout the book. He was smoking a pipe in a pure oxygen environment? Really? It reminded me of the scene in the preview for the movie Thank you for Smoking where the characters are talking about the impossibility of smoking on a space station when one of them says, "All we have to do is insert a line saying 'Thank ___ for the blump device/procedure" which will allow smoking to take place in outer space." Every time I read about Griffith's father puffing away on his pipe made me laugh. It was too funny.

It was a fun book to read; it has been well night thirty years since I last read it [the original copy I read was apparently an updated paperback owned by one of my uncles].
Profile Image for Jim Mcclanahan.
314 reviews28 followers
July 2, 2012
I probably read this when I was 12 or 13 (The Winston Science Fiction series). I'm sure I enjoyed it immensely then. But memory fades after more than 50 years. Re-reading it now is not quite the same. I was overly conscious of the paranoid flavor of the speculations of the characters about not only the "enemy", but also each other. Certainly a red scare flavor. But a fun tale for kids of the time (1953).
Profile Image for Charles.
Author 41 books283 followers
September 22, 2008
I don't rememember much about this book. Young adult space opera. Kenneth Wright is apparently really Lester Del Rey.
Profile Image for Charles.
Author 41 books283 followers
June 17, 2009
Not great, not terible. A decent read. I have an old version under the pseudonym Kenneth Wright.
Profile Image for Ingrid Tamm.
27 reviews18 followers
December 22, 2015
Sometimes annoying, sometimes weird, but all together an enjoyable read
Displaying 1 - 18 of 18 reviews

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