Which planet does not have rings? Saturn

Uranus

Neptune

Mars

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine

What are cutting "steps" or terraces