Hans Vlietstra

Hans Vlietstra

Hans Vlietstra
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Humans generally like stability. We are used to our small, predictable world: Every 24 hours, we rotate on our axis; every 365 days, we revolve around the

Humans generally like stability. We are used to our small, predictable world: Every 24 hours, we rotate on our axis; every 365 days, we revolve around the

Dwarf planet Pluto has one giant moon, Charon, but now is known to have four more tiny satellites.

Dwarf planet Pluto has one giant moon, Charon, but now is known to have four more tiny satellites.

Rigel

Rigel

Arcturus

Arcturus

Vega

Vega

Sirius

Sirius

How do dying stars shed their mass and become red supergiants? New observations of the red supergiant Betelgeuse are surprising and confusing to scientists.

How do dying stars shed their mass and become red supergiants? New observations of the red supergiant Betelgeuse are surprising and confusing to scientists.