Cheap Astronomy - Dear CA #120: Different Perspectives

The 365 Days of Astronomy

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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