Recent content by Si_187

That's awesome, thankyou!

People haven't but man-made objects have gone way beyond Earth's hill sphere/zero-velocity limit. The argument regarding humans never escaping the local group is based around objects outside it receeding from us faster than the speed of light by the time we could get to the edge of the group...

Wow didn't even realize we had a satellite Sextans dwarf galaxy, there's that many dwarf galaxies knocking about. Its funny, this topic is no doubt considered niche in the physics community, but we're talking about the very frontier that humanity can ever reach considering the cosmological horizon.

Ah ok yeah, incorrect assumption from me to begin with that they were within the zero-velocity surface. Along with them being strongly red-shifted (at least Saggitarius Dwarf Irregular is blue-shifted) it seems kinda odd that they would ever be considered within the local group then. This...

The opening paragraphs on the Wikipedia articles for Sextans A and B both describe them as possibly being part of the local group. Interestingly there is a similar uncertainty over the Saggitarius Dwarf Irregular Galaxy, despite that lying outside the zero-velocity surface. Perhaps the...

Hi all. Awesome site! Just wondering if anyone can answer my question: If the Sextans galaxies are inside the group's zero velocity surface, why is there uncertainty over whether they're part of the group?