astronomy

crazyminner, godzinę temu w This Earth-sized Exoplanet is On a Death Spiral

How fast is that in kilometers per hour?

kichae, godzinę temu (edited 40 minut temu)

The paper doesn’t calculate the radius of the star’s Roche limit, instead opting to calculate the orbital period of the Roche limit. I’ve never done a Roche limit calculation for stars, but I have for planets/moons, and I’m not seeing anything that suggests it’s different than for planets. So, I think I did this correctly (excepting typos):

The star’s Roche limit is about 1.5 million km from its centre (~1 million km above its surface), and the planet’s orbit is about 2 million km from the star’s centre. Assuming a circular orbit, which should be the case at these distances, the orbit has a circumference of about 12.7 million km, and the planet is whipping around at a speed of about 2.3 million km/h, or 0.2% the speed of light.

buggy-pull-buggy, 5 dni temu w Citizen Astronomers Help Confirm New Temperate Jupiter

That is pretty f'n sweet

Olap, 12 dni temu w New interstellar object candidate heading toward the sun

fosstodon.org/ - this scientist reckons 0.2AU to Mars. Still 30m km. And thus about 100x further than the moon. But it only took Armstrong three days to do that distance!

Could we slingshot between the earth and the moon a probe to reach it’s relative solar velocity and chase it down? Does anyone know the bounds of that?

Pronell, 12 dni temu w Exoplanets that cling too tightly to their stars trigger their own doom: 'This is a completely new phenomenon'

This is phrased like the planets have some choice. It’s weird.

Geodad, 13 dni temu w A rare chance to see two exploding stars is happening in the southern sky

These never seem to happen in the northern hemisphere.

Or maybe they do, and there’s so much light pollution that they never bother to report on them.

Evil_Shrubbery, 13 dni temu

wiki/History_of_supernova_observation

Animation showing the sky position of supernovae discovered since 1885. Some recent survey contributions are highlighted in color.

https://lemmy.zip/api/v3/image_proxy?url=https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fen%2Fa%2Fac%2FSN_Discoveries_1885-2019.gif

SweetCitrusBuzz, 13 dni temu w Scientists look to black holes to know exactly where we are in the Universe. But phones and Wi-Fi are blocking the view

Yeah, we need fewer satellites really.

As for the rest, that’s not easily solved.

pennomi, 14 dni temu w Scientists look to black holes to know exactly where we are in the Universe. But phones and Wi-Fi are blocking the view

I still think they should build out a lunar crater radio telescope out there on the dark side of the moon. The radio silence and scale would be impossible to get any other way.

ogmios, 14 dni temu

scale

That’s an interesting thought I hadn’t considered. The Webb is about as quiet as we’re going to get anywhere near our orbit, but a lunar compound could very easily be much larger, and would be a great deal easier to service/upgrade.

pennomi, 14 dni temu

The dark side of the moon is shielded from the planet’s radio by the whole moon. So it’s a pretty attractive place to set up.

Plus, several candidate craters have favorable geometry for a massive radio telescope.

It truly is one of my favorite proposals.

quediuspayu, 14 dni temu

That’s the far side.

pennomi, 14 dni temu

Yes the far side of the moon is colloquially (and incorrectly) called the dark side of the moon. Thanks for the correction.

agamemnonymous, 14 dni temu w Scientists look to black holes to know exactly where we are in the Universe. But phones and Wi-Fi are blocking the view

I get the actual issue, but that title sounds hilariously boomer.

al_Kaholic, 14 dni temu w Scientists look to black holes to know exactly where we are in the Universe. But phones and Wi-Fi are blocking the view

It’s starstink muskings up the sky.

ogmios, 14 dni temu w Scientists look to black holes to know exactly where we are in the Universe. But phones and Wi-Fi are blocking the view

And slowly, society began to awaken to the reality that theirs was a civilization ruled by Mammon, not men.

InternetCitizen2, 16 dni temu w NASA's been pulling out of major astronomy meetings — and scientists are feeling the effects

True shame.

itsgroundhogdayagain, 17 dni temu w NASA's been pulling out of major astronomy meetings — and scientists are feeling the effects

Go on without us. We’re headed back to the Dark Ages.

henfredemars, 17 dni temu w NASA's been pulling out of major astronomy meetings — and scientists are feeling the effects

NASA is kill. They had something like a 50% budget cut planned.

ericbejlic, 18 dni temu (edited 14 dni temu) w Leaving Pluto in the dust: New Horizons probe gearing up for epic crossing of 'termination shock'

Equipped with functioning instruments and still transmitting data, New Horizons will provide scientists valuable insight into the edge of our local solar system, helping us understand the transition zone between solar and interstellar environments.

Deebster, 19 dni temu w Webb captures evidence of a lightweight planet around TWA 7

I’m pretty sure you wouldn’t be able to get a custom number plate of that star’s name.