Mrs Calloway’s Reviews > Simply Astronomy > Status Update
Mrs Calloway
is on page 97 of 160
Compared with open clusters, globular clusters contain more stars – up to several million – and the stars are older: typically 10 billion years, almost as old as the universe itself. Laura clusters are some of the first parts of a galaxy to form, perhaps before the disc. New staff formation has largely ceased, all the raw materials in the initial gas cloud having been used up.
— Sep 13, 2026 07:05PM
Like flag
Mrs Calloway’s Previous Updates
Mrs Calloway
is on page 152 of 160
Looking up at the centre means gazing into the very centre of the Milky Way, which is also the location of the supermassive black hole Sagittarius A
— Sep 13, 2026 07:47PM
Mrs Calloway
is on page 130 of 160
The human eye looks for patterns. The first constellations were grouping of stars that ancient people used for navigation, timekeeping, or storytelling.
— Sep 13, 2026 07:42PM
Mrs Calloway
is on page 119 of 160
8 out of 10 US children born today will not be able to see the Milky Way
— Sep 13, 2026 07:39PM
Mrs Calloway
is on page 109 of 160
The cosmological principle suggests that all parts of the universe were once connected. It supports the theory that the universe originated in the Big Bang and then expanded. The largest scale structures we see today originate from energy fluctuations in the early universe that have been spread out, leaving filament of matter surrounding empty voids.
— Sep 13, 2026 07:12PM
Mrs Calloway
is on page 97 of 160
The stars in a globular cluster of gravitationally bound to each other. They follow complex orbits within spherical distribution that is more tightly packed towards the centre.
— Sep 13, 2026 07:06PM
Mrs Calloway
is on page 96 of 160
Stars that are born together stay together, at least initially, in groups called clusters. There are two main kinds of cluster: open and globular. And open cluster is a loose group of stars formed from the same cloud of gas and and dust.
— Sep 13, 2026 07:04PM
Mrs Calloway
is on page 93 of 160
Super massive black holes, more than 100,000 times the mass of the sun, I thought to lie at the centres of most large galaxies, and they may play a role in galaxy formation
— Sep 13, 2026 07:02PM
Mrs Calloway
is on page 91 of 160
Supernova can admit more light than several billion sons and outshining entire galaxies
— Sep 13, 2026 07:01PM
Mrs Calloway
is on page 90 of 160
Stars can end spectacularly bright explosions called supernovae… briefly out shining and entire galaxy, a supernova usually fades within a few months
— Sep 13, 2026 07:00PM
Mrs Calloway
is on page 82 of 160
Cool the stars glow red, emitting mostly low energy, long wavelength light; the hottest stars are blue, admitting mostly high energy, short wavelength light.
— Sep 13, 2026 06:57PM