Short Answer – the temperature of a black hole is inversely proportional to its mass. For a black hole with the same mass as our Sun the temperature is 60 billionths of a degree kelvin.
In the almost 20 years since the discovery of the first exoplanet orbiting a main-sequence star, we have gone from thinking that planets are a cosmic curiosity to a common feature of the Universe. The race is on to find a true Earth twin, to measure an exoplanet atmosphere or, when the James Webb Space…
We all get the munchies, but when you’re a supermassive black hole (SMBH) your hunger might have dire consequences. And just like that an SMBH has outgrown its galaxy and jumped to the top of the heavyweight objects in the universe.
About 12 billion light years from us, there is a galaxy called CID-947. It has a mass similar to our own Milky Way (about 1000 billion times the mass of the Sun) and it was only remarkable because it had an active galactic nucleus (AGN, i.e. an accreting SMBH).
As I mentioned in a previous post, there are a few ways to measure the distance of a star in our galaxy. Unfortunately when the Luminosity is unknown and it is too far away to use parallaxes method, we are stumped for ways to estimate the distance.
Once in a while though we get lucky and we have events that allow us to calculate distance in other ways. Circinus X-1 is one of these events. Circinus X-1 is an x-ray binary; an x-ray binary is a system of two stars where material from one companion is accreting on the neutron star, which in turns emits x-rays.
Pluto, not to be confused with Micky Mouse’s dog, is going to be in the news a lot soon, as we are finally going to take a closer look to the elusive dwarf planet. Pluto Stats: Discovered by Clyde Tombaugh on the 18th of February 1930, it is smaller than our Moon with a 1184…
As we discussed in the previous vlog our understanding of stars is still incomplete, but there are areas which we are very confident on what we know.
In general we tend to know three things about stars: their brightness, their spectrum, and if they are close enough or of known luminosity, we can also know their distance.
The cosmos has plenty of terrifying Lovecraftian features, but one of my favourites is the Space Roar.
There is a loud radio signal, described as a constant hiss, that seems to pervade the cosmos. It is louder than the radio signature of radio galaxies, and it is without explanation.
Every few months, I see articles about Betelgeuse, the right shoulder in the constellation of Orion, ready to go supernova. The articles vary from the sensational to the apocalyptic and I can understand why it is a fascinating subject. A supernova in our galactic backyard.
I have a mathematician friend who believes that anything that it is mathematically possible exists somewhere in the multiverse. She believes that there are some features that are so beautiful, that it would be a crime if they were simply quirks of the Universal language.
I have a space question. I know about the Roche limit but is there an upper limit to how big a ring can get compared to its planet?
Asked by Dan
Of course there are limits, the Universe is all about limits! But they’re not as strict as one would think.
We have found an object in 2012, J1407b, with a ring system 200 million kilometres in diameter. If the rings were centred on Earth they would cover the inner solar system all the way to the orbit of Mercury on the opposite side of the Sun.
I was asked by Larry, one of my students, about what would be the best place in the solar system to destroy the One Ring. Since the 25th of March is the anniversary of its destruction and the fall of Sauron I thought I’d dedicate this vlog to answering the question as seriously and as accurately as possible.