Skip to content
Cover of Cosmos by Carl Sagan

Book · Non-fiction, memoir and self-help

Cosmos

by Carl Sagan

Page count, estimated reading time and reading quiz: everything to know before you start Cosmos, and the Vread challenge to get to the end.

Pages
365
Reading time
≈ 6 h 40 min
Checkpoints
13
Genre
Non-fiction
Take the challengeAlready have the app? Open the book

Free on iPhone and Android.

How long does it take to read Cosmos?

At 365 pages, Cosmos is a fairly long book. Expect about 6 hours 40 minutes of reading to finish it, based on 250 words per page and an average reading speed of 230 words per minute. A fast reader will go quicker; a careful read (or reading in a second language) will take longer.

At 30 minutes a day, that is about 14 days of reading. At the median pace of Vread readers, 72 pages per reading day, it takes 6 reading days. For a book of this length (250 to 399 pages), Vread readers who finish it take a median of 4.7 days between the first and the last checkpoint (Vread Reading Barometer 2026).

Reading days to finish it
30 minutes a day14 days
Vread median pace (72 pp./day)6 days

Estimates; see the method at the bottom of the page.

Prove you read it

The Vread challenge: 13 checkpoints

  1. Checkpoint 1, page 28
  2. Checkpoint 2, page 56
  3. Checkpoint 3, page 84
  4. Checkpoint 4, page 112
  5. Checkpoint 5, page 140
  6. Checkpoint 6, page 168
  7. Checkpoint 7, page 197
  8. Checkpoint 8, page 225
  9. Checkpoint 9, page 253
  10. Checkpoint 10, page 281
  11. Checkpoint 11, page 309
  12. Checkpoint 12, page 337
  13. Checkpoint 13, page 365

In Vread, Cosmos is split into 13 checkpoints, one every 28 pages or so. At each checkpoint, a question covers the passage you have just read: a correct answer validates the step, and your progress moves forward like a training plan.

The challenge: validate all 13 checkpoints through to the last page. No giant quiz at the end, no summary to copy out: short questions along the way that prove the book was actually read. It also works as a reading quiz to check your understanding before a test.

Also available in French on Vread.

Illustrative example

Checkpoint 1/13pp. 1–28

What a checkpoint looks like

A short, precise question about the pages you have just read: a character, a place, a choice.

The answer is in the text: reply in the app.

This is not a question from Cosmos: to avoid spoilers, the real questions stay in the app.

Answer in the app, one checkpoint at a time.

Summary, quiz, reviews: frequently asked questions

How many pages is Cosmos?
The edition listed on Vread has 365 pages. The exact count varies by edition (paperback, hardback, ebook).
How long does it take to read Cosmos?
About 6 hours 40 minutes of reading, or 14 days at 30 minutes a day.
Is there a quiz on Cosmos?
Yes: the Vread app has 13 reading questions on Cosmos, one per checkpoint, unlocked as you read.
Where can I find a summary of Cosmos?
Vread does not publish summaries: the app supports reading the book itself, part by part. Checkpoint questions cover what you have just read, which makes them a good way to check you did not miss anything.

Similar books: non-fiction, memoir and self-help

All books: non-fiction, memoir and self-helpAll genres

Read Cosmos with Vread

Add the book to your library, read at your own pace in whatever format you use, and validate each checkpoint. Vread is free on iPhone and Android.

Take the challenge

Written by Vread from its catalogue data (page count of the listed edition, checkpoints, ratings aggregated from 10 ratings). No summary or publisher text is reproduced. Reading times are estimates; see the method in the Vread Reading Barometer (in French).