Ground based attempts to detect gravitational waves on Earth have so far been unsuccessful and can only look for gravitational waves with relatively high frequencies.

地基检测器曾尝试在地球上探测引力波，但至今尚未成功，而且其只能检测频率相当高的引力波。

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As the planets congealed, gravitational forces and particle collisions created the high temperatures necessary to melt metals floating around in space, and minerals began their diversification.

行星凝聚过程中，重力和微粒碰撞造就了高温环境，这对融化漂浮在太空中的金属粒子是必需的，各种矿物也开始形成。

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Chemical rockets have the high thrust necessary to lift rockets into space, overcoming the Earth's gravitational pull.

化学燃料动力火箭可以提供克服地球引力所必须的强大推进力。

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As the planets congealed, gravitational forces and particle collisions created the high temperatures necessary to melt metals floating around in space, and minerals began their diversification.

ECONOMIST: Minerals

The problem becomes less acute once they've cleared the atmosphere, but the high speeds required to escape the Earth's gravitational field (more than 6.8 miles per second) necessitate an enormous amount of energy.

FORBES: Houston, We Have Problems

For GPS, this is an enormous issue because it turns out that the clocks on the satellites drift by almost 40, 000 nanoseconds per day relative to the clocks on the ground because they are high above the earth's surface (and therefore in a weaker gravitational field) and are moving fast relative to the ground.

BBC: Meet the world's director of time