You can help search for hidden stellar-mass black holes by classifying signals in TESS star-brightness data through Zooniverse’s Black Hole Hunters project. Volunteers examine computer-selected candidates; they do not make a discovery simply by joining, and any promising signal needs scientific follow-up.
What Black Hole Hunters is asking volunteers to do
Black Hole Hunters is a citizen-science project hosted on Zooniverse. Its official page describes the activity as real research and provides a “Get Started” route, along with classification and discussion areas. The project page lists its launch date as October 26, 2021; an October 2026 article publicized the search, but that does not mean the project itself began in 2026.
As an Amazon Associate I earn from qualifying purchases.
The task is to inspect candidate changes in stellar brightness, not to observe stars through a telescope. The project description says no astronomy background is needed. For the current interface and classification instructions, use the project’s tutorial: Black Hole Hunters on Zooniverse.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCrashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWhy a hidden black hole might change a star’s brightness
Many familiar black-hole detections involve an interacting binary: gas pulled from a companion star heats up as it falls toward the black hole and can produce bright X-rays. Black Hole Hunters is aimed at a different possibility—a wider binary in which the black hole is not actively drawing in material from its companion. Without that glowing infall, the black hole may be effectively invisible to ordinary direct observation.
#1 Best Overall
- 【Excellent Optics】Astronomical telescope features 80mm aperture 600mm(f/6.7) focal length-The big aperture can capture more light; high transmission multi-fully coated optical lens can improve light transmittance, reduce the reflection of light. It will bring you more bright and clear images.
- 【Portable & Stable】Our refractor telescope has a backbag, an adjustable aluminum tripod and an upgraded phone adapter. All accessories can be packed into the bag, which is convenient for you to carry and storage for traveling. The tripod is stable and the height can adjust from 17.7" to 52", which is suitable for adults and kids. With the phone adapter, you can take amazing photos through your phone.
- 【Easy to Operate】 This telescope is easy to assemble even for astronomy beginners and kids. You can set up easily with the detail installation manual and video. No tools are required. It’s a great astronomy gift telescope for adults, astronomy enthusiasts, beginners and kids 8-12.
- 【Optimum Magnification】Our telescope for kids and adults is equipped with two replaceable excellent-quality eyepiecesa (20mm and 9mm) for 30X and 66X magnification. A moon filter transmits only 13 percent of the incoming light and improving contrast. Also with 5x24 finderscope, you can locate objects easily. A great option for astronomy lovers to explore the moon, Saturn and Jupiter.
- 【Satisfaction Service】We provide 3 years satisfaction service. If you have any questions about the product and service, please feel free to contact us to get 24-hour technical support from our expert team. Whether observing moon or viewing planets, our telescope can meet your all needs. It’s a great telescope for adults & 8-12 kids & astronomy beginners.
Self-lensing in a binary
As the two objects orbit, the black hole can pass in front of its stellar companion from our viewpoint. Its gravity bends and focuses some of the companion’s light, briefly magnifying it. This effect is called self-lensing. Because the objects orbit, a brightness change could recur on a regular schedule, leaving a pattern in the star’s light curve.
This search concerns stellar-mass black holes paired with stars—not Sagittarius A*, the supermassive black hole at the center of the Milky Way. A self-lensing signal would also not, by itself, prove that the foreground object is a black hole; other explanations must be considered.
Rank #2
- Superior Optics: 400mm(f/5.7) focal length and 70mm aperture, fully coated optics glass lens with high transmission coatings creates stunning images and protect your eyes. Perfect full positive telescope for astronomers to explore stars and moon.
- Magnification: Come with two replaceable eyepieces and one 3x Barlow lens.3x Barlow lens trebles the magnifying power of each eyepiece. 5x24 finder scope with mounting bracket and cross-hair lines inside make locating objects easily.
- Wireless Remote: This refractor telescope includes one smart phone adapter and one Wireless camera remote to explore the nature of the world easily through the screen and take amazing celestial images.
- Adjustable Tripod: This telescope allows for many different viewing positions with a adjustable aluminum alloy tripod and a carry bag, the telescope and tripod can fit inside the bag for easy traveling and storage.
- Satisfaction: Buy with confidence from a leading manufacturer.
How TESS data and human review fit together
The search uses light curves from NASA’s Transiting Exoplanet Survey Satellite (TESS), records of how a star’s apparent brightness changes over time. An AI system screened the data and surfaced candidate signals. People then inspect those candidates because periodic changes can arise from more than one kind of astronomical phenomenon.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
IFLScience reported on October 2, 2026, that a neural network had screened 15 million stellar light curves and surfaced 1 million candidate signals in one week. Those figures describe the model’s reported screening and output, not a count of black holes or verified lensing events. The article also reported five known self-lensing systems at that time, none containing a black hole. The project team’s expectation of dozens of detections from TESS data is a forecast, not a result.
Rank #3
- SMARTPHONE-POWERED SKY TOUR: No experience needed! Just dock your phone, launch the StarSense Explorer app, and follow the on-screen arrows to locate stars, planets, nebulae, and more.
- PATENTED STARSENSE TECHNOLOGY: Unlike other astronomy apps, StarSense Explorer uses sky recognition technology to turn your phone into a celestial navigation system, analyzing star patterns overhead to pinpoint your telescope’s position.
- TONIGHT’S BEST TARGETS, INSTANTLY: The app generates a curated list of the top objects to see based on your time and location. See planets, bright nebulae, galaxies, and star clusters from the city—and even more from dark skies.
- SIMPLE SETUP, SMOOTH TRACKING: Features a manual altazimuth mount with altitude slow motion adjustment with a sliding rod. Follow the on-screen arrows to your target; when the bullseye turns green, you can view it clearly through the eyepiece.
- 114MM REFLECTOR WITH IMPRESSIVE VIEWS: The 4.5" Newtonian reflector with high-reflectivity coatings delivers sharp, vivid views of the Moon, planets like Jupiter and Saturn, and deep-sky favorites like the Orion Nebula and Andromeda Galaxy.
How to take part
- Open the official Black Hole Hunters project page on Zooniverse and choose “Get Started.”
- Read the project’s current tutorial and examples before classifying candidates. The reviewed project description does not provide a detailed classification rubric, so follow the instructions shown in the live task rather than relying on a guessed rule.
- Inspect the supplied brightness data and classify it according to the project’s guidance. You are reviewing survey data, not collecting observations with personal equipment.
- Use the project’s discussion area if you want to talk through classifications or questions with the community.
What a candidate can—and cannot—tell us
A candidate is a signal worth inspecting, not a confirmed black hole. Periodic brightness changes can have other causes, and a promising pattern needs professional analysis and follow-up before researchers can establish what produced it. Participation gives volunteers a chance to help sift the candidates, but it cannot guarantee that any one person will identify a new object.
IFLScience’s October 2026 article described the Milky Way as having about 50 known stellar-mass black holes against an estimated population of around 100 million, and reported the closest known one as about 1,600 light-years away. These are figures attributed to that article, not counts established by the Zooniverse project page. The scale of the gap helps explain the interest in methods that could reveal systems without bright X-ray emission.
Rank #4
- Superior Optics: Dianfan astronomy telescope features a focal length of 800 mm and a fully coated 90 mm objective lens. The large aperture gathers more light for brighter, clearer views, high-transmission coatings enhance contrast and color for sharp, vivid images for an enjoyable stargazing experience
- Powerful Magnification: With two eyepieces and a 3× Barlow lens, this telescope offers 32×–240× magnification. It allows you to observe craters and lunar seas on the surface of the Moon. With the 45° zenith mirror, images are upright and correctly oriented for terrestrial viewing, making distant targets details easier to observe. The telescope is ideal for beginners and astronomy enthusiasts
- Quick Setup & Beginner-Friendly: User-friendly design with clear instructions makes assembly simple—ready in about 15 minutes. Smooth focusing helps you quickly locate targets. Perfect for families to enjoy stargazing and explore the night sky together
- Portable & Versatile: Lightweight design with a sturdy stainless steel tripod ensures stable, steady viewing. Easy to carry in the included bag, making it perfect for travel and outdoor adventures. Suitable for stargazing, birdwatching, wildlife observation, and exploring cityscapes
- Professional Astronomical Telescope: The Dianfan 90x800 telescope combines quality , functionality and reliability. It delivers high-resolution views that bring the universe closer. Designed for adults high powered, it inspires interest in astronomy and science while encouraging exploration of the starry sky
Project leader Dr Adam McMaster told IFLScience: “We’re hoping to be the first ones to find [a self-lensing system] containing a black hole, but a neutron star will be interesting too!” A neutron star could also produce a scientifically useful result, but it would not be a black-hole discovery.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteQuick Recap
Best Value
- BRIGHT, SHARP VIEWS ANYWHERE: Unlike many beginner telescopes, this quality refractor features fully coated glass lenses and a 70mm aperture for crisp, clear views of the Moon, planets, and daytime scenery—all in a lightweight, travel-ready design.
- PERFECT FIRST TELESCOPE FOR BEGINNERS: Designed for adults and kids to enjoy together, this beginner-friendly telescope sets up in minutes and delivers rewarding views with no prior experience required.
- EASY NO-TOOL SETUP: No complicated assembly or tools needed. The full-height tripod and telescope tube set up in seconds and pack neatly into the included backpack—so you’re always ready to observe on the go.
- DUAL EYEPIECES FOR VERSATILE VIEWS: Includes 20mm and 10mm eyepieces for wide and close-up views of celestial and terrestrial targets. Spot craters on the Moon at night or wildlife during the day.
- BONUS BACKPACK AND SOFTWARE: Includes a padded backpack with room for accessories, a finderscope, star diagonal, eyepieces, and a free download of Starry Night software to help you identify celestial objects and plan your next stargazing session.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
