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On this day in 1949 – May 1st – Gerard Kuiper discovered Neptune's moon Nereid.

Nereid was the second known moon of Neptune. It was discovered over a century after William Lassell discovered the first one, Triton.

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On this day in 1996 – May 1st – Comet Hyakutake made its closest approach to Sun.

It's known as The Great Comet of 1996. its passage near the Earth was one of the closest cometary approaches of the previous 200 years.

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On this day in 1989 – May 4th – NASA's Magellan spacecraft was released by Space Shuttle mission STS-30 Atlantis, the first interplanetary mission to be so launched.

The spacecraft, often referred to as the Venus Radar Mapper, went on to map the surface of Venus using synthetic aperture radar which is able to penetrate the planet's thick clouds.

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On this day in 2002 – May 4th – NASA launched the Aqua scientific research satellite.

Aqua was the second major component of the Earth Observing System (EOS), and was designed to study the precipitations, evaporation and cycling of water.

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On this day in 1961 – May 5th – Alan Shepard became the first American in space, making a suborbital flight in Freedom 7.

Ten years later Shepard walked on the Moon as the commander of Apollo 11.

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On this day in 1872 – May 6th – Dutch astronomer and mathematician Willem de Sitter was born in Sneek, Netherlands.

He is best remembered for his contributions to cosmology, in particular for showing that a universe containing very little matter would expand. This paved the way for later research carried out by the American astronomer Edwin Hubble who was to provide observational evidence that the universe is expanding. De Sitter's work was honored with two prestigious awards, the Gold Medal of the Royal Astronomical Society and the Bruce Medal of the Astronomical Society of the Pacific.

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When we say "expanding" does that mean just spreading away from the center?

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When we say "expanding" does that mean just spreading away from the center?

Angie, I thought I'd find a nice straightforward answer to your question. Wikipedia said:
Quote
In mathematical physics, n-dimensional de Sitter space (often abbreviated to dSn) is a maximally symmetric Lorentzian manifold with constant positive scalar curvature. It is the Lorentzian analogue of an n-sphere (with its canonical Riemannian metric).
They did flag it: This article may be too technical for most readers to understand. "May be"!!! Ha! Ha! Even way back when I studied this stuff, that would have left me cross-eyed.

But science writer Marcus Woo answers your question succinctly:
Quote
The universe, in fact, has no center. Ever since the Big Bang 13.7 billion years ago, the universe has been expanding. But despite its name, the Big Bang wasn't an explosion that burst outward from a central point of detonation. The universe started out extremely compact and tiny. Then every point in the universe expanded equally, and that continues today. And so, without any point of origin, the universe has no center.

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On this day in 1900 – May 9th – Cecilia Payne-Gaposchkin was born in Wendover, Buckinghamshire, England.

Cecilia Payne was the first woman to earn a PhD in astronomy from Radcliffe College of Harvard University. And in her PhD thesis, she was the first person to propose that stars were composed mainly of hydrogen and helium.

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On this day in 2003 – May 9th – the Japanese spacecraft Hayabusa ("peregrine falcon") was launched.

Hayabusa was the first mission to return a sample of material from an asteroid.

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