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.
Iapetus is the third largest satellite of Saturn, and it is the largest object in the solar system not in hydrostatic equilibrium. Iapetus is a moon of Saturn known for its colour dichotomy. It has a dark side and white side, and it is often called the Yin Yang moon.
Are Mimas and Miranda the smallest known objects in hydrostatic equilibrium? Dan – London This question relates to the shape of astrophysical objects and as we discussed in the past, it’s an important characteristic of stars, and it’s in the definition of “planet”. An object is round
A new paper accepted for publication this month has highlighted how spiral galaxies came to form in the early Universe. By using the power of the Atacama Large Millimeter/submillimeter Array (ALMA), a team lead by Roberto Maiolino has individuated the mechanism through which galaxies gather stellar
In this vlog, I talk about Prof. Payne-Gaposchkin, one the most important astronomers of the 20th Century. Thanks to her we know that stars are not made by the same elements as the Earth, and that Hydrogen is the most abundant element in the Universe.
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
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
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.