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Earth behaves as an artificial pulsar, with the strongest pulses for alien observers when NorthAmerica is either rising or setting.
Q9: What is the nearest huge cluster of
Q18: Why do we believe galaxy clusters are
Q20: A spherical galaxy, like M87, which
Q23: A large cluster's mass can be over
Q27: The pregalactic blobs had masses similar to:<br>A)the
Q54: On average, the stars in elliptical galaxies
Q60: Compared to the Milky Way, how many
Q64: Star streams that are seen around the
Q93: A galaxy is at a distance of
Q113: In what sense is all observable deuterium