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LM35: Temperature sensor

Part Number: LM35

I know the specification of this temperature sensor and my doubt is

1) how this type of sensor can be useful for measuring the negative  temperature if we are using the Arduino as a microcontroller 

I know that Vout = adc value *  (reference voltage/ adc resolution) 

T= vout/10mV

As I Know that ADC value cannot be negative how this sensor sense the negative temperature, can you help resolving this question?

2) Is this temperature sensor is suitable for space application? If not please suggest me the temperature sensor for space application ranging from -40 to +150oC