Cheap Astronomy - Dear CA #120: Different Perspectives

Hosted by Steve Nerlich.


Looking askance…


Dear Cheap Astronomy – have we got any spacecraft on the other
side of the Sun?


Well, yes and no. Nearly all our spacecraft orbit the Sun – since
they are either orbiting Earth or another planet or are touring
the asteroid belt – and hence they’ve all been around the back of
the Sun at one time another. The only spacecraft we don’t have
orbiting the Sun are the ones on their way out of the Solar
System – the Pioneers, the Voyagers and New Horizons, which have
sufficient escape velocities to leave solar orbit.


 


Dear Cheap Astronomy – Hubble crisis


So there’s a crisis in cosmology apparently. Although, in most
respects it’s just business as usual really. There aren’t many
scientists who are overwhelmed by existential angst when they
suddenly realize they don’t know everything. The crisis first
started being talked around 2014 as it became apparent there
consistent discrepancies in measurements of the Hubble constant,
which is a measurement of how fast the Universe is expanding.


 


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