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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesYou can help scientists search for hidden black holes by classifying graphs of star brightness on the Black Hole Hunters project on Zooniverse. The task uses supplied survey data, so you do not need a telescope or to analyze raw data yourself.
How to take part in Black Hole Hunters
- Open the Black Hole Hunters project on Zooniverse and choose the project’s start or classify option if it is available.
- Read the on-screen instructions, then inspect the supplied graph of a star’s brightness over time. This kind of graph is called a light curve.
- Look for a short, distinct rise in brightness resembling the project’s examples. Flag curves that appear to match; the project combines volunteer classifications as part of its research workflow.
- Check the live project page for the current workflow and activity. The available subjects and project status can change.
What volunteers should look for in the graph
In a black-hole self-lensing event, gravity bends and focuses light. If a black hole in a binary system passes in front of its ordinary-star companion from our viewpoint, the companion can appear briefly brighter. The clue is a characteristic peak in the light curve—not light shining from the black hole itself.
The signal is only a candidate when a volunteer flags it. Scientists must review and follow up on possible events; a classification alone does not establish that a black hole has been found.
Why the project includes simulated curves
The project FAQ says events are rare and that simulated curves help teach volunteers the shapes to look for and estimate the weakest magnification they can detect. The FAQ also cautions that those simulations are not accurate enough to serve as machine-learning training data. They are learning and detectability aids, not observed discoveries. Read the Black Hole Hunters FAQ.
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Which survey data does the search use?
The project describes two data contexts. Its earlier search used observations from SuperWASP, a ground-based survey; its current research page describes a search using data from NASA’s TESS space telescope. Both provide time-series measurements of stellar brightness for volunteers to classify. Follow the workflow offered on the live project page rather than assuming both searches are currently open.
The project page says its search concerns hidden compact objects in binary systems. Its SuperWASP page reports about 30 known binary systems containing black holes and 100–200 containing neutron stars, without stating a publication year for those figures. It also describes a computer-simulation prediction of hundreds of thousands of binary systems with non-accreting compact objects in the Galaxy; that is a model prediction, not an observed count. See the SuperWASP project page.
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What is known about the search results?
The Black Hole Hunters FAQ gives expected yields of about 10 possible examples in the full SuperWASP dataset and about a hundred or so in TESS data. Those are project expectations, not confirmed detections, and the FAQ does not state a publication year for them.
The project results page says results from the SuperWASP version are forthcoming and that the team is following up several interesting candidates. That status does not mean any candidate has been confirmed. The FAQ says that no conclusive examples of black-hole self-lensing in a binary system had been found at the time represented by that page; because project status can change, consult the current results page for the latest update. Check Black Hole Hunters results.
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Who runs the project?
The team page lists Adam McMaster of the University of Southampton and The Open University, Hugh Dickinson of The Open University, and Matthew Middleton of the University of Southampton as project leads. McMaster’s 29 October 2021 launch post described the goal as finding gravitational microlensing, where an otherwise invisible black hole briefly magnifies the light from its companion star. Read the SuperWASP launch post.
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