Why could it have been possible for Jocelyn Bell to have thought the signals she found were artificial?
What will be an ideal response?
Pulsars have very regular, repetitive signals that are more uniform than the best atomic clocks on Earth.
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Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of the
A) energy emitted by distant quasars, which is far larger than can be explained by the visible matter in the quasars. B) gravitational bending of light from distant galaxies as it passes other galaxies on its way to Earth. C) redshift in the light from the earliest galaxies in the universe. D) force of gravity acting on laboratory objects. E) redshift in the light from the explosions of distant supernovas.
A parallel-plate capacitor has a capacitance of 10 mF and charged with a 20 V power supply. The power supply is then removed and a dielectric of dielectric constant 4 is used to fill the space between the plates
The energy now stored by the capacitor is A) 250 mJ. B) 125 mJ. C) 500 mJ. D) zero. E) 62.5 mJ.
Light from Proxima Centauri takes 4.2 years to reach Earth
Indicate whether the statement is true or false
Most stars are usually formed singularly or as binaries, not in clusters
Indicate whether the statement is true or false