只有拥有球形膨胀物质的星系才可能容纳超大质量的黑洞。
Only galaxies with a spherical bulge—like component appear to accommodate supermassive black holes.
我们能够探测到的物质很少——大概是能够逆转膨胀物质的30%。
The amount we can detect is relatively small — 5 percent of the matter needed to reverse expansion.
另一种可能性是加速膨胀不是来自物质而是修改的重力形式，其作用在时空的宇宙尺度上是不同的。
Another possibility is that the accelerated expansion arises not from a substance but from a modified form of gravity, one that behaves differently on cosmic scales of time and space.
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