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Artist's concept of an intermediate-mass black hole. Photo: NASA/JPL-Caltech

Scientists may need to cast a wide net, searching across a range of frequencies in order to find never-before-observed intermediate-mass black holes if they crash together in deep space, according to a study in Nature Astronomy this week.

Why it matters: Intermediate-mass black holes — those that are 100–100,000 times the mass of the Sun — represent a gap in humanity's understanding of the universe and could be key to figuring out just how our cosmos evolved over time.

What they found: LIGO can, in theory, pick up ripples in space-time from intermediate-mass black holes today, but according to the new study, it will take future detectors to get a more complete view of the mysterious objects.

  • The space-based LISA observatory — which is expected to launch in the 2030s — will be able to search for those gravitational waves at lower frequencies than LIGO.
  • That range of frequencies between the instruments will allow scientists on the ground to observe these types of black holes and others as they spiral in toward each other for extended periods of time before merging.
  • "If LISA sees it, that means it is going to appear in LIGO's [frequency] band four years later," Karan Jani, an author of the new study, told Axios.

What's next: New ground-based observatories could also help scientists parse signal from noise and find direct evidence if these types of black holes exist.

  • Scientists aren’t just looking for these types of black holes through gravitational waves, either. Astronomers have found a number of candidate intermediate-mass black holes through X-ray signatures as well.

Go deeper:

Go deeper

Updated 58 mins ago - Health

Massage, facial, pedicure... intravenous drip?

A salon on the Upper East Side of New York that offers IV drip therapies. Photo: Jennifer A. Kingson/Axios

IV drips — the kind you might get if you're rushed to the hospital — are trending as a spa treatment, thanks in part to endorsements by celebrities like Kim Kardashian and Madonna.

Why it matters: Like other "wellness" trends with a whiff of medical imprimatur, IV nutrient drips can be harmless or mildly restorative — or go awry, particularly in the wrong hands.

U.S. sounds alarm on Ukraine

Conscripts line up at a Russian railway station yesterday before departing for Army service. Photo: Sergei Malgavko/TASS via Getty Images

The Biden administration is "deeply concerned" by new intelligence — detailed for Axios and other outlets — showing Russia stepping up preparations to invade Ukraine as soon as early 2022.

Why it matters: Most of this was known from public sources and satellite imagery, but the administration is sending a stronger signal by releasing specific details from the intelligence community.

Felix Salmon, author of Capital
3 hours ago - Economy & Business

Philanthropy in the age of crypto

Illustration: Annelise Capossela/Axios

The best charities are increasingly effective. That's the clear message sent by Open Philanthropy, the think tank that doubles as the grant-making vehicle for Facebook co-founder Dustin Moskovitz and his wife Cari Tuna.

Why it matters: With tech and crypto wealth becoming a fast-growing part of the philanthropic pie, there's more of an emphasis than ever on effectiveness — what the newly-divorced Melinda French Gates, in her recent Giving Pledge update, characterizes as giving as "impactfully as possible."