A (pressure drop) can be gravitational.Logical formLearned from2 sentences. (Contour lines) may represent gravitational waves.Logical formLearned from2 sentences. A gravitational force may act on an one.Logical formLearned from2 sentences. A gravitational attraction can be to the sun.Logical formLearned from2 sentences. A gravitational attraction to the sun may dominate some planetary motion.Logical formLearned from2 sentences. Gravitational interaction may generate tidal tails.Logical formLearned from2 sentences. Gravitational interaction can be between galaxies.Logical formLearned from2 sentences. Electrons can be due to effects of gravitational interaction.Logical formLearned from2 sentences. Gravitational interaction may be amplified by extra space.Logical formLearned from2 sentences. (Cluster formation) can be by gravitational collapse.Logical formLearned from2 sentences. Gravitational waves may be seen.Logical formLearned from2 sentences. A gravitational field can be intense that something-is-the-case.Logical formLearned from2 sentences. A gravitational force may pertain-to a mass.Logical formLearned from2 sentences. Celestial objects can be with gravitational fields.Logical formLearned from2 sentences. A configuration may have a gravitational energy.Logical formLearned from2 sentences.