Mercury has extreme temperature differences.
Fact #147
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The Voyager probes have traveled beyond the heliosphere.
Fact #1028 · Space
Some stars appear to dim irregularly for reasons that are still studied.
Fact #1599 · Space
The Sun occasionally emits powerful solar flares.
Fact #1620 · Space
The Milky Way contains regions of active star formation.
Fact #219 · Space
The Moon's gravity affects ocean tides.
Fact #195 · Space
The observable universe is about 93 billion light‑years wide.
Fact #1865 · Space
Some pulsars emit beams of radiation like cosmic lighthouses.
Fact #1610 · Space
Comets are made of ice, dust, and rocky material.
Fact #33 · Space
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