No Man's Sky Space Encounters: Anomaly Detectors, Rerolling & Every Rare Find

Part of the Exploration & Endgame series:

• Exploration & Endgame Guide Hub: Start here.
• Derelict Freighters Guide: The encounter people confuse this with.

Quick Answer

• Space encounters are scripted events that interrupt your pulse drive in open space. Traders are common; the interesting ones are rare.
• An Anomaly Detector is a single-use item that forces the next encounter instead of waiting for one. Activate it in your inventory, then pulse, and your ship flies straight to it.
• Detectors are found while mining asteroids, rarely. They are not sold and cannot be crafted.
• The reroll trick: when an encounter is detected, ignore it and keep pulsing. About twenty seconds later the game rolls another. Repeat indefinitely as long as your pulse fuel holds. Roughly one encounter every twenty-one seconds.
• Encounter tables are weighted by rarity and by context. Living ship encounters appear far more often when you are flying a living ship, and some only appear in specific star types.
• An Anomaly Detector is not an Emergency Signal Scanner. Detectors find anomalous objects; scanners find boardable derelict freighters. This is the single most common mix-up in the game.
• Rogue black holes, living frigates and the strangest one-off encounters all live in this system. There is no other way to see them.

Overview

Almost everything in No Man's Sky is something you go and find. Space encounters are the exception: they come to you, and only while you are pulsing between planets with nothing much on your mind.

Most players meet a handful by accident in their first hundred hours, assume they are flavour, and never think about them again. That is a reasonable read, because the common ones genuinely are flavour: an alien trader wanting to sell you something, a drifting object worth a few units. But the same table holds a rogue black hole that flings you across the galaxy, an encounter that hands over a living frigate for your fleet, and a set of one-off oddities that exist nowhere else in the game.

The difference between meeting those once by luck and meeting them deliberately is understanding two things: how the roll works, and what an Anomaly Detector is for. Neither is explained in game.

How Encounters Actually Spawn

Engage the pulse drive in open space and the game starts rolling. Every so often the roll succeeds, your pulse drops out, and something is there.

Each encounter type has its own rarity weight. The scale runs roughly one to twelve, and lower means rarer. Alien traders sit at the common end, which is why they are most of what you see. The genuinely rare entries sit at fractions of a point: the boardable derelict freighter encounter is rated at a quarter, which is why nobody stumbles across one by accident.

Context shifts the table. Two modifiers are worth knowing:

• Flying a living ship substantially increases living-ship-related encounters. If you are hunting those, fly the living ship rather than your best hauler.
• Star colour matters. Some encounters only appear in specific system types, with red systems in particular being associated with living ship content. The hyperdrive upgrades guide covers unlocking access to the coloured star classes.

Nothing about your progression gates them. There is no unlock. A twenty-hour save and a thousand-hour save roll from the same table.

Anomaly Detectors: What They Do and Where They Come From

An Anomaly Detector is a one-use consumable that removes the waiting.

How to use it:

1. Open your inventory in open space and activate the detector.
2. It probes the surrounding area and marks something.
3. Engage the pulse drive. Your ship flies straight towards the marked object and drops out of pulse on arrival.

That is the whole interaction. What you arrive at is drawn from the encounter table, so a detector does not let you choose which encounter. It guarantees that you get one now rather than in twenty minutes.

Where they come from: mining asteroids. That is essentially it. They turn up rarely in asteroid yields, and there is no merchant, no blueprint, and no refiner recipe. Anyone who has a stack of detectors got them by spending a great deal of time shooting rocks.

Because they are scarce and non-renewable in any practical sense, the sensible policy is to hoard them and use them for a specific purpose rather than burning them out of curiosity. Which brings us to the trick that makes them far less necessary than they look.

The Reroll Trick

This is the single most useful thing on this page, and it costs nothing.

When an encounter is detected, the game gives you a notification and your pulse drive prepares to drop out. If you ignore it and keep pulsing, roughly twenty seconds later the game simply rolls again and detects something else.

You can repeat this indefinitely. As long as your pulse drive has fuel, you get a fresh encounter roll about every twenty-one seconds, and you can keep skipping until something you actually want appears.

What this changes:

• Rare encounter hunting becomes a matter of patience, not luck. Point yourself at empty space, hold pulse, and let the rolls cycle. A rating-of-one encounter that would take an age to meet passively becomes a question of how long you are willing to hold the button.
• Anomaly Detectors become close to redundant for most purposes. They save you the waiting, but the reroll loop already compresses the waiting enormously.
• Pulse fuel is the real cost. Carry Tritium. Asteroids are the source, which is convenient, since asteroid mining is also where detectors come from.

The one thing to be careful about: the reroll consumes the encounter you skipped. If the notification names something you wanted, stop pulsing.

Detectors vs Emergency Signal Scanners

These two items get confused constantly, and the confusion costs people entire evenings.

The trap: you can meet a derelict freighter as a random space encounter, and an Anomaly Detector can produce that encounter. But the encounter version is rated among the rarest entries in the table, so burning detectors hoping for a derelict is a losing strategy.

If you want a derelict, get an Emergency Signal Scanner. Helios gives one away free every week, and the derelict freighters guide covers the run itself. Save your detectors for anything else.

What You Are Hunting For

The table is long and most of it is unremarkable. These are the entries worth holding the pulse button for.

Rogue black holes. A black hole encountered in open space rather than at a system's marked black hole. Using one throws you a long way towards the galactic core, which makes it relevant to anyone working through the centre run.

Living frigates. Since the Endurance update, the encounter system is how you obtain a living frigate for your fleet. The organic capital ship that behaves differently from the metal ones. If you want one, this page is the mechanism. Fly a living ship in a red system and reroll. The frigate fleet guide covers what having one actually does for you.

Boardable derelict freighters. Extremely rare as an encounter. Use a scanner instead, as above.

Alien traders and drifting objects. Common, minor, occasionally worth stopping for if the trade is good.

The strange ones. There is a tail of one-off encounters that exist purely to be unsettling, and describing them in detail spoils them. They are the reason to run the reroll loop for its own sake once, on a quiet evening, and see what turns up.

A Practical Encounter Run

If you want to actually farm this rather than read about it:

1. Load Tritium. A full cargo slot or two. Pulse fuel is the constraint on the whole activity, and asteroids replenish it in place.
2. Pick the right ship. Hunting living ship content means flying a living ship. Otherwise take whatever has the best pulse fuel efficiency.
3. Pick the right system. Red systems for living ship encounters. Otherwise anywhere.
4. Point at nothing. Aim into open space away from planets, so a planet's gravity does not drop you out of pulse mid-roll.
5. Hold pulse and read the notifications. Skip what you do not want, stop for what you do.
6. Top up on asteroids when fuel runs low. This is also where detectors come from, so the loop feeds itself.

Twenty minutes of this produces more encounters than fifty hours of ordinary play.

FAQ

Where do you get Anomaly Detectors in No Man's Sky?

From mining asteroids, rarely. There is no vendor, no blueprint and no refining recipe. If you want a stock of them, spend time shooting asteroids, which you should be doing anyway for Tritium.

What is the difference between an Anomaly Detector and an Emergency Signal Scanner?

A detector forces a random space encounter. A scanner finds a boardable derelict freighter specifically. If you want to loot a derelict, use a scanner. Helios on the Space Anomaly gives one free each week.

Can I choose which space encounter I get?

Not directly. But you can reroll: ignore a detected encounter and keep pulsing, and about twenty seconds later the game rolls another. Repeat until you get what you want. Context matters too. Flying a living ship and warping to red systems weights the table towards living ship encounters.

How do I get a living frigate?

Through the space encounter system, which is the only route. Fly a living ship, warp to a red star system, and run the reroll loop until the encounter appears. It is rare, so budget pulse fuel and time rather than expecting it in the first few minutes.

Do space encounters happen in every star system?

The common ones do. Some entries in the table are restricted to particular system types, and living ship content in particular is associated with red systems. If a specific encounter refuses to appear, changing the star colour you are hunting in is the first thing to try.

Is there any reason to use a detector rather than just rerolling?

Speed, and only speed. A detector skips the wait for a first roll. Given that detectors are genuinely scarce and the reroll loop is free, most players are better off saving detectors and holding the pulse button instead.

Key Takeaways

• Encounters roll while you pulse, weighted by rarity, and the good ones are rare enough that nobody meets them by accident.
• The reroll trick is the whole game: ignore a detection, keep pulsing, get another roll about twenty seconds later, repeat.
• Anomaly Detectors force one encounter and come from asteroid mining. Hoard them; the reroll loop makes them a luxury rather than a necessity.
• A detector is not an Emergency Signal Scanner. If you want to board a derelict, get the scanner from Helios.
• Fly a living ship in a red system if you are hunting living ship content, including the living frigate.
• Tritium is the real currency of encounter hunting. Load up, and refuel from the same asteroids that drop detectors.
• Rogue black holes met this way are a genuine shortcut towards the galactic core.