Astronomers predict an unseen class of star-like bodies called “dark dwarfs” near our galaxy’s center. A new study suggests these objects could shine thanks to annihilating dark matter, not nuclear fusion. Dark matter makes up about a quarter of the universe and interacts via gravity. If WIMP-like dark matter particles collect in a brown dwarf, they would annihilate and heat it, causing a faint glow. Dark dwarfs would be too light to fuse hydrogen, but would keep lithium-7 in their atmospheres, offering a signature. This prediction comes from a JCAP study. The discovery of one could reveal dark matter’s nature.
Predicted Dark Dwarf Properties
According to the paper, sub-stellar objects just below the hydrogen-burning threshold would be powered by dark matter. The authors find that the minimum mass for hydrogen fusion shifts above ∼0.075 M⊙ in dense dark-matter environments, so lighter brown dwarfs instead become stable dark-matter–powered stars (‘dark dwarfs’) via WIMP annihilation inside them. They predict such objects only appear in regions with extremely high dark-matter density, like the Galactic center (ρ_DM ≳ 10^3 GeV/cm^3), because further out the halo is too tenuous. Crucially, dark dwarfs should retain lithium-7 in mass ranges where ordinary brown dwarfs burn it away, providing a clear observational signature.
Observational Prospects and Implications
Sakstein notes that powerful telescopes like the James Webb Space Telescope might even already detect extremely cold objects like dark dwarfs near the galactic center. Alternatively, astronomers could survey brown dwarf populations for a rare sub-class with anomalous lithium content. Notably, even one confirmed dark dwarf would strongly favor heavy, self-annihilating dark matter.
Sakstein explains that finding dark dwarfs would provide “compelling evidence” for dark matter that is massive and interacts with itself – essentially WIMPs or similar particles. He notes that lighter candidates (like axions) would not produce such stars, so a dark dwarf discovery would disfavor those models. While not a proof of WIMPs, a dark dwarf detection would imply dark matter behaves like WIMPs (heavy and weakly interacting). Indeed, future surveys and JWST observations will also test these predictions.
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#Dark #Dwarfs #StarLike #Objects #Reveal #Nature #Dark #Matter
![FCC Chairman Wants to Repeal a Key Rule That Would Fundamentally Change Broadcast News
Federal Communications Commission Chairman Brendan Carr wants to repeal a rule that has prevented a select handful of broadcasters from taking full control of the media landscape. Back in 2004, Congress instructed the FCC to enact a national ownership cap that would bar any one broadcast station owner from reaching more than 39% of American households. For more than 20 years, the rule has kept mega mergers in the TV broadcasting industry from gobbling up the entire media ecosystem. Now, Carr is proposing to repeal that national ownership cap rule, which, if successful, would mean broadcast TV giants will pretty much have a green light for mergers, even if it meant that one company would gain access to most of the media landscape. Carr expressed his intentions in an op-ed published by the far-right organization Breitbart. In the op-ed, he claimed that the cap was once helpful in protecting local news stations, but now it was becoming an obstacle as they compete with national news, large streamers, and social media giants.
Instead of a blanket rule, Carr wants to create a new “case-by-case approach.” “Previously, the cap operated as a blanket prohibition on any and all deals that would combine stations in excess of the 39 percent limit—regardless of whether it was a good deal or a bad one for the country,” Carr wrote in the op-ed. “Our new proposal would allow the FCC to approve deals that exceed the 39 percent cap, but only if doing so would promote the public interest.”
Major broadcasters have been lobbying for a change to the rule for quite some time now. One such mega TV broadcasting company that lobbied for the rule change is Nexstar. Earlier this year, the FCC granted Nexstar a waiver for the 39% national ownership cap rule and approved its acquisition of rival Tegna. The merger is still currently facing court challenges over antitrust claims, but if it is finalized, then Nexstar is estimated to expand its reach to at least 60% of American households. Sinclair, another Trump-allied major broadcaster that was behind a particularly infamous PR debacle during Trump’s first administration, is also eyeing a merger and commended the proposed rule change as “common sense.” Both companies also famously refused to air Jimmy Kimmel’s show on their channels late last year after the late-night host’s comments about Charlie Kirk drew ire from the Trump administration.
[embed]https://www.youtube.com/watch?v=_fHfgU8oMSo[/embed] The FCC will vote on eliminating the rule on August 6th. There are three commissioners, two Republicans and one Democrat. The lone Democratic FCC Commissioner, Anna Gomez, took to X to voice her staunch opposition. “The FCC just announced it will move forward with its unlawful effort to hand control of the public airwaves to billionaire buddies of this administration,” Gomez wrote. “This will destroy local newsrooms, silence community reporting, and drive-up costs for American families.” Even if the action passes the FCC vote, it’s likely to receive pushback from both sides of the aisle in Congress. “Trump’s FCC Chair is trying to illegally rewrite the rules to make it easier for billionaires to line their own pockets while jacking up costs and controlling what Americans watch,” Sen. Elizabeth Warren said in a statement. “After rubber-stamping the Nexstar-Tegna megamerger, this looks like the Trump administration’s latest attempt to roll out the red carpet for more antitrust disasters.”
Critics believe that because the rule was created following Congress’s action, it is up to Congress to determine if it should be retired. But Carr insists that the FCC has the authority to modify or repeal the rule. #FCC #Chairman #Repeal #Key #Rule #Fundamentally #Change #Broadcast #NewsBrendan carr,broadcast television,FCC](https://i1.wp.com/gizmodo.com/app/uploads/2026/07/GettyImages-2262359639-1280x888.jpg?ssl=1 "FCC Chairman Wants to Repeal a Key Rule That Would Fundamentally Change Broadcast News
Federal Communications Commission Chairman Brendan Carr wants to repeal a rule that has prevented a select handful of broadcasters from taking full control of the media landscape. Back in 2004, Congress instructed the FCC to enact a national ownership cap that would bar any one broadcast station owner from reaching more than 39% of American households. For more than 20 years, the rule has kept mega mergers in the TV broadcasting industry from gobbling up the entire media ecosystem. Now, Carr is proposing to repeal that national ownership cap rule, which, if successful, would mean broadcast TV giants will pretty much have a green light for mergers, even if it meant that one company would gain access to most of the media landscape. Carr expressed his intentions in an op-ed published by the far-right organization Breitbart. In the op-ed, he claimed that the cap was once helpful in protecting local news stations, but now it was becoming an obstacle as they compete with national news, large streamers, and social media giants.
Instead of a blanket rule, Carr wants to create a new “case-by-case approach.” “Previously, the cap operated as a blanket prohibition on any and all deals that would combine stations in excess of the 39 percent limit—regardless of whether it was a good deal or a bad one for the country,” Carr wrote in the op-ed. “Our new proposal would allow the FCC to approve deals that exceed the 39 percent cap, but only if doing so would promote the public interest.”
Major broadcasters have been lobbying for a change to the rule for quite some time now. One such mega TV broadcasting company that lobbied for the rule change is Nexstar. Earlier this year, the FCC granted Nexstar a waiver for the 39% national ownership cap rule and approved its acquisition of rival Tegna. The merger is still currently facing court challenges over antitrust claims, but if it is finalized, then Nexstar is estimated to expand its reach to at least 60% of American households. Sinclair, another Trump-allied major broadcaster that was behind a particularly infamous PR debacle during Trump’s first administration, is also eyeing a merger and commended the proposed rule change as “common sense.” Both companies also famously refused to air Jimmy Kimmel’s show on their channels late last year after the late-night host’s comments about Charlie Kirk drew ire from the Trump administration.
[embed]https://www.youtube.com/watch?v=_fHfgU8oMSo[/embed] The FCC will vote on eliminating the rule on August 6th. There are three commissioners, two Republicans and one Democrat. The lone Democratic FCC Commissioner, Anna Gomez, took to X to voice her staunch opposition. “The FCC just announced it will move forward with its unlawful effort to hand control of the public airwaves to billionaire buddies of this administration,” Gomez wrote. “This will destroy local newsrooms, silence community reporting, and drive-up costs for American families.” Even if the action passes the FCC vote, it’s likely to receive pushback from both sides of the aisle in Congress. “Trump’s FCC Chair is trying to illegally rewrite the rules to make it easier for billionaires to line their own pockets while jacking up costs and controlling what Americans watch,” Sen. Elizabeth Warren said in a statement. “After rubber-stamping the Nexstar-Tegna megamerger, this looks like the Trump administration’s latest attempt to roll out the red carpet for more antitrust disasters.”
Critics believe that because the rule was created following Congress’s action, it is up to Congress to determine if it should be retired. But Carr insists that the FCC has the authority to modify or repeal the rule. #FCC #Chairman #Repeal #Key #Rule #Fundamentally #Change #Broadcast #NewsBrendan carr,broadcast television,FCC")
![FCC Chairman Wants to Repeal a Key Rule That Would Fundamentally Change Broadcast News
Federal Communications Commission Chairman Brendan Carr wants to repeal a rule that has prevented a select handful of broadcasters from taking full control of the media landscape. Back in 2004, Congress instructed the FCC to enact a national ownership cap that would bar any one broadcast station owner from reaching more than 39% of American households. For more than 20 years, the rule has kept mega mergers in the TV broadcasting industry from gobbling up the entire media ecosystem. Now, Carr is proposing to repeal that national ownership cap rule, which, if successful, would mean broadcast TV giants will pretty much have a green light for mergers, even if it meant that one company would gain access to most of the media landscape. Carr expressed his intentions in an op-ed published by the far-right organization Breitbart. In the op-ed, he claimed that the cap was once helpful in protecting local news stations, but now it was becoming an obstacle as they compete with national news, large streamers, and social media giants.
Instead of a blanket rule, Carr wants to create a new “case-by-case approach.” “Previously, the cap operated as a blanket prohibition on any and all deals that would combine stations in excess of the 39 percent limit—regardless of whether it was a good deal or a bad one for the country,” Carr wrote in the op-ed. “Our new proposal would allow the FCC to approve deals that exceed the 39 percent cap, but only if doing so would promote the public interest.”
Major broadcasters have been lobbying for a change to the rule for quite some time now. One such mega TV broadcasting company that lobbied for the rule change is Nexstar. Earlier this year, the FCC granted Nexstar a waiver for the 39% national ownership cap rule and approved its acquisition of rival Tegna. The merger is still currently facing court challenges over antitrust claims, but if it is finalized, then Nexstar is estimated to expand its reach to at least 60% of American households. Sinclair, another Trump-allied major broadcaster that was behind a particularly infamous PR debacle during Trump’s first administration, is also eyeing a merger and commended the proposed rule change as “common sense.” Both companies also famously refused to air Jimmy Kimmel’s show on their channels late last year after the late-night host’s comments about Charlie Kirk drew ire from the Trump administration.
[embed]https://www.youtube.com/watch?v=_fHfgU8oMSo[/embed] The FCC will vote on eliminating the rule on August 6th. There are three commissioners, two Republicans and one Democrat. The lone Democratic FCC Commissioner, Anna Gomez, took to X to voice her staunch opposition. “The FCC just announced it will move forward with its unlawful effort to hand control of the public airwaves to billionaire buddies of this administration,” Gomez wrote. “This will destroy local newsrooms, silence community reporting, and drive-up costs for American families.” Even if the action passes the FCC vote, it’s likely to receive pushback from both sides of the aisle in Congress. “Trump’s FCC Chair is trying to illegally rewrite the rules to make it easier for billionaires to line their own pockets while jacking up costs and controlling what Americans watch,” Sen. Elizabeth Warren said in a statement. “After rubber-stamping the Nexstar-Tegna megamerger, this looks like the Trump administration’s latest attempt to roll out the red carpet for more antitrust disasters.”
Critics believe that because the rule was created following Congress’s action, it is up to Congress to determine if it should be retired. But Carr insists that the FCC has the authority to modify or repeal the rule. #FCC #Chairman #Repeal #Key #Rule #Fundamentally #Change #Broadcast #NewsBrendan carr,broadcast television,FCC](https://gizmodo.com/app/uploads/2026/07/GettyImages-2262359639-1280x888.jpg "FCC Chairman Wants to Repeal a Key Rule That Would Fundamentally Change Broadcast News
Federal Communications Commission Chairman Brendan Carr wants to repeal a rule that has prevented a select handful of broadcasters from taking full control of the media landscape. Back in 2004, Congress instructed the FCC to enact a national ownership cap that would bar any one broadcast station owner from reaching more than 39% of American households. For more than 20 years, the rule has kept mega mergers in the TV broadcasting industry from gobbling up the entire media ecosystem. Now, Carr is proposing to repeal that national ownership cap rule, which, if successful, would mean broadcast TV giants will pretty much have a green light for mergers, even if it meant that one company would gain access to most of the media landscape. Carr expressed his intentions in an op-ed published by the far-right organization Breitbart. In the op-ed, he claimed that the cap was once helpful in protecting local news stations, but now it was becoming an obstacle as they compete with national news, large streamers, and social media giants.
Instead of a blanket rule, Carr wants to create a new “case-by-case approach.” “Previously, the cap operated as a blanket prohibition on any and all deals that would combine stations in excess of the 39 percent limit—regardless of whether it was a good deal or a bad one for the country,” Carr wrote in the op-ed. “Our new proposal would allow the FCC to approve deals that exceed the 39 percent cap, but only if doing so would promote the public interest.”
Major broadcasters have been lobbying for a change to the rule for quite some time now. One such mega TV broadcasting company that lobbied for the rule change is Nexstar. Earlier this year, the FCC granted Nexstar a waiver for the 39% national ownership cap rule and approved its acquisition of rival Tegna. The merger is still currently facing court challenges over antitrust claims, but if it is finalized, then Nexstar is estimated to expand its reach to at least 60% of American households. Sinclair, another Trump-allied major broadcaster that was behind a particularly infamous PR debacle during Trump’s first administration, is also eyeing a merger and commended the proposed rule change as “common sense.” Both companies also famously refused to air Jimmy Kimmel’s show on their channels late last year after the late-night host’s comments about Charlie Kirk drew ire from the Trump administration.
[embed]https://www.youtube.com/watch?v=_fHfgU8oMSo[/embed] The FCC will vote on eliminating the rule on August 6th. There are three commissioners, two Republicans and one Democrat. The lone Democratic FCC Commissioner, Anna Gomez, took to X to voice her staunch opposition. “The FCC just announced it will move forward with its unlawful effort to hand control of the public airwaves to billionaire buddies of this administration,” Gomez wrote. “This will destroy local newsrooms, silence community reporting, and drive-up costs for American families.” Even if the action passes the FCC vote, it’s likely to receive pushback from both sides of the aisle in Congress. “Trump’s FCC Chair is trying to illegally rewrite the rules to make it easier for billionaires to line their own pockets while jacking up costs and controlling what Americans watch,” Sen. Elizabeth Warren said in a statement. “After rubber-stamping the Nexstar-Tegna megamerger, this looks like the Trump administration’s latest attempt to roll out the red carpet for more antitrust disasters.”
Critics believe that because the rule was created following Congress’s action, it is up to Congress to determine if it should be retired. But Carr insists that the FCC has the authority to modify or repeal the rule. #FCC #Chairman #Repeal #Key #Rule #Fundamentally #Change #Broadcast #NewsBrendan carr,broadcast television,FCC")
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