"Quest Through Space and Time (Perry Rhodan, 9)" by Clark Darlton,
translated by Wendayne Ackerman
https://www.amazon.com/Quest-Through-Space-Perry-Rhodan/dp/0441659780/

Book number nine of a series of one hundred and twenty-six space opera
books in English. The original German books, actually pamphlets, number
in the thousands. The English books started with two translated German
stories per book and transitioned to one story per book with the sixth
book. The German books were written from 1961 to present time, having
sold two billion copies and even recently been rebooted. I read the
well printed and well bound book published by Ace in 1971 that I had to
be very careful with due to age. I actually own two copies of this
book, a first edition and a third edition. I bought an almost complete
box of Perry Rhodans a decade or two ago on ebay that I am finally
getting to since I lost my original Perry Rhodans in The Great Flood of
1989. In fact, I now own book #1 to book #100.
https://en.wikipedia.org/wiki/Perry_Rhodan

In this alternate universe, USSF Major Perry Rhodan and his three fellow
astronauts blasted off in a three stage rocket to the Moon in 1971. The
first stage of the rocket was chemical, the second and third stages were
nuclear. After crashing on the Moon due to a strange radio
interference, they discover a massive crashed alien spaceship with an
aged male scientist (Khrest), a female commander (Thora), and a crew of 500.

Perry Rhodan and his crew are now looking for the race of beings who
"live longer than the sun". They find out that the Arkonide explorers
visited the Vega and Sol star systems almost 10,000 years before and
were connected to the immortal beings.

This book also has a tribute essay by Forrest Ackerman to John W.
Campbell who passed away in 1971.
https://en.wikipedia.org/wiki/John_W._Campbell
And a tribute essay by Forrest Ackerman to Michael Rennie ("The Day The
Earth Stood Still") who passed away in 1971.
https://en.wikipedia.org/wiki/Michael_Rennie

One has to remember that this book was written in German in 1961 and
translated to English in 1970. Many items that came about in the 1970s
and beyond such as cell phones are not reflected in the book. However,
commercial aircraft commonly traveling at Mach 3 are not available to
the public as talked about in the book. Niels Bohr's saying "Prediction
is very difficult, especially about the future" comes to mind.

My rating: 4 out of 5 stars
Amazon rating: 4.8 out of 5 stars (6 reviews)

Lynn